Fundies. English
Segment disclosures
Company overviewALLIANT ENERGY CORP
Each reported dimension combination stays separate. Revenue and operating income are shown as reported, with their dates and sources.
Revenue · Reported segment facts
74 dimension combinations 784 retained observations 10 reported periods Partial retained history
Counts describe retained dimensioned rows only. Periods and members can change across reports, and this view does not infer missing values or expected segment totals.
Ipl · Other Customer · Other Utility
Legal Entity · Major Customers · Statement Business Segments
Source dimensions
dei:LegalEntityAxis=lnt:IplMember;srt:MajorCustomersAxis=us-gaap:OtherCustomerMember;us-gaap:StatementBusinessSegmentsAxis=lnt:OtherUtilityMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2024-04-01 – 2024-06-30 | 0 | USD | 2024-08-02 · 15:51:55.000Z | Open filing evidence |
| 2024-01-01 – 2024-06-30 | 3000000 | USD | 2024-08-02 · 15:51:55.000Z | Open filing evidence |
Ipl · Electric
Legal Entity · Statement Business Segments
Source dimensions
dei:LegalEntityAxis=lnt:IplMember;us-gaap:StatementBusinessSegmentsAxis=lnt:ElectricMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-04-01 – 2026-06-30 | 431000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2026-01-01 – 2026-06-30 | 867000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2026-01-01 – 2026-03-31 | 437000000 | USD | 2026-05-01 · 15:07:49.000Z | Open filing evidence |
| 2025-01-01 – 2025-12-31 | 1896000000 | USD | 2026-02-20 · 19:58:00.000Z | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 608000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 1455000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 418000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 848000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2025-01-01 – 2025-03-31 | 430000000 | USD | 2026-05-01 · 15:07:49.000Z | Open filing evidence |
| 2024-01-01 – 2024-12-31 | 1747000000 | USD | 2026-02-20 · 19:58:00.000Z | Open filing evidence |
| 2024-07-01 – 2024-09-30 | 523000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
| 2024-01-01 – 2024-09-30 | 1318000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
| 2024-04-01 – 2024-06-30 | 404000000 | USD | 2025-08-08 · 15:49:01.000Z | Open filing evidence |
| 2024-01-01 – 2024-06-30 | 795000000 | USD | 2025-08-08 · 15:49:01.000Z | Open filing evidence |
Ipl · Electric · Other Customer
Legal Entity · Statement Business Segments · Major Customers
Source dimensions
dei:LegalEntityAxis=lnt:IplMember;us-gaap:StatementBusinessSegmentsAxis=lnt:ElectricMember;srt:MajorCustomersAxis=us-gaap:OtherCustomerMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2024-04-01 – 2024-06-30 | 4000000 | USD | 2024-08-02 · 15:51:55.000Z | Open filing evidence |
| 2024-01-01 – 2024-06-30 | 7000000 | USD | 2024-08-02 · 15:51:55.000Z | Open filing evidence |
Ipl · Gas
Legal Entity · Statement Business Segments
Source dimensions
dei:LegalEntityAxis=lnt:IplMember;us-gaap:StatementBusinessSegmentsAxis=lnt:GasMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-04-01 – 2026-06-30 | 43000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2026-01-01 – 2026-06-30 | 166000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2026-01-01 – 2026-03-31 | 122000000 | USD | 2026-05-01 · 15:07:49.000Z | Open filing evidence |
| 2025-01-01 – 2025-12-31 | 265000000 | USD | 2026-02-20 · 19:58:00.000Z | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 27000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 185000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 40000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 158000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2025-01-01 – 2025-03-31 | 118000000 | USD | 2026-05-01 · 15:07:49.000Z | Open filing evidence |
| 2024-01-01 – 2024-12-31 | 250000000 | USD | 2026-02-20 · 19:58:00.000Z | Open filing evidence |
| 2024-07-01 – 2024-09-30 | 27000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
| 2024-01-01 – 2024-09-30 | 175000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
| 2024-04-01 – 2024-06-30 | 40000000 | USD | 2025-08-08 · 15:49:01.000Z | Open filing evidence |
| 2024-01-01 – 2024-06-30 | 148000000 | USD | 2025-08-08 · 15:49:01.000Z | Open filing evidence |
Ipl · Other Utility
Legal Entity · Statement Business Segments
Source dimensions
dei:LegalEntityAxis=lnt:IplMember;us-gaap:StatementBusinessSegmentsAxis=lnt:OtherUtilityMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-04-01 – 2026-06-30 | 1000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2026-01-01 – 2026-06-30 | 3000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2026-01-01 – 2026-03-31 | 2000000 | USD | 2026-05-01 · 15:07:49.000Z | Open filing evidence |
| 2025-01-01 – 2025-12-31 | 47000000 | USD | 2026-02-20 · 19:58:00.000Z | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 12000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 36000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 11000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 24000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2025-01-01 – 2025-03-31 | 12000000 | USD | 2026-05-01 · 15:07:49.000Z | Open filing evidence |
| 2024-01-01 – 2024-12-31 | 49000000 | USD | 2026-02-20 · 19:58:00.000Z | Open filing evidence |
| 2024-07-01 – 2024-09-30 | 11000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
| 2024-01-01 – 2024-09-30 | 34000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
| 2024-04-01 – 2024-06-30 | 9000000 | USD | 2025-08-08 · 15:49:01.000Z | Open filing evidence |
| 2024-01-01 – 2024-06-30 | 23000000 | USD | 2025-08-08 · 15:49:01.000Z | Open filing evidence |
Wpl · Electric
Legal Entity · Statement Business Segments
Source dimensions
dei:LegalEntityAxis=lnt:WplMember;us-gaap:StatementBusinessSegmentsAxis=lnt:ElectricMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-04-01 – 2026-06-30 | 430000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2026-01-01 – 2026-06-30 | 881000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2026-01-01 – 2026-03-31 | 451000000 | USD | 2026-05-01 · 15:07:49.000Z | Open filing evidence |
| 2025-01-01 – 2025-12-31 | 1801000000 | USD | 2026-02-20 · 19:58:00.000Z | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 516000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 1373000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 433000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 855000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2025-01-01 – 2025-03-31 | 423000000 | USD | 2026-05-01 · 15:07:49.000Z | Open filing evidence |
| 2024-01-01 – 2024-12-31 | 1625000000 | USD | 2026-02-20 · 19:58:00.000Z | Open filing evidence |
| 2024-07-01 – 2024-09-30 | 476000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
| 2024-01-01 – 2024-09-30 | 1261000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
| 2024-04-01 – 2024-06-30 | 385000000 | USD | 2025-08-08 · 15:49:01.000Z | Open filing evidence |
| 2024-01-01 – 2024-06-30 | 785000000 | USD | 2025-08-08 · 15:49:01.000Z | Open filing evidence |
Wpl · Gas
Legal Entity · Statement Business Segments
Source dimensions
dei:LegalEntityAxis=lnt:WplMember;us-gaap:StatementBusinessSegmentsAxis=lnt:GasMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-04-01 – 2026-06-30 | 39000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2026-01-01 – 2026-06-30 | 187000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2026-01-01 – 2026-03-31 | 149000000 | USD | 2026-05-01 · 15:07:49.000Z | Open filing evidence |
| 2025-01-01 – 2025-12-31 | 260000000 | USD | 2026-02-20 · 19:58:00.000Z | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 24000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 181000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 36000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 158000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2025-01-01 – 2025-03-31 | 122000000 | USD | 2026-05-01 · 15:07:49.000Z | Open filing evidence |
| 2024-01-01 – 2024-12-31 | 215000000 | USD | 2026-02-20 · 19:58:00.000Z | Open filing evidence |
| 2024-07-01 – 2024-09-30 | 22000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
| 2024-01-01 – 2024-09-30 | 147000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
| 2024-04-01 – 2024-06-30 | 29000000 | USD | 2025-08-08 · 15:49:01.000Z | Open filing evidence |
| 2024-01-01 – 2024-06-30 | 125000000 | USD | 2025-08-08 · 15:49:01.000Z | Open filing evidence |
Wpl · Other Utility
Legal Entity · Statement Business Segments
Source dimensions
dei:LegalEntityAxis=lnt:WplMember;us-gaap:StatementBusinessSegmentsAxis=lnt:OtherUtilityMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-04-01 – 2026-06-30 | 1000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2026-01-01 – 2026-06-30 | 2000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2026-01-01 – 2026-03-31 | 0 | USD | 2026-05-01 · 15:07:49.000Z | Open filing evidence |
| 2025-01-01 – 2025-12-31 | 4000000 | USD | 2026-02-20 · 19:58:00.000Z | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 0 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 1000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 0 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 1000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2025-01-01 – 2025-03-31 | 1000000 | USD | 2026-05-01 · 15:07:49.000Z | Open filing evidence |
| 2024-01-01 – 2024-12-31 | 5000000 | USD | 2026-02-20 · 19:58:00.000Z | Open filing evidence |
| 2024-07-01 – 2024-09-30 | 1000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
| 2024-01-01 – 2024-09-30 | 2000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
| 2024-04-01 – 2024-06-30 | 1000000 | USD | 2025-08-08 · 15:49:01.000Z | Open filing evidence |
| 2024-01-01 – 2024-06-30 | 1000000 | USD | 2025-08-08 · 15:49:01.000Z | Open filing evidence |
Retail Commercial · Ipl · Electric
Major Customers · Legal Entity · Statement Business Segments
Source dimensions
srt:MajorCustomersAxis=lnt:RetailCommercialMember;dei:LegalEntityAxis=lnt:IplMember;us-gaap:StatementBusinessSegmentsAxis=lnt:ElectricMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-01-01 – 2026-03-31 | 142000000 | USD | 2026-05-01 · 15:07:49.000Z | Open filing evidence |
| 2025-01-01 – 2025-12-31 | 609000000 | USD | 2026-02-20 · 19:58:00.000Z | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 192000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 462000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 135000000 | USD | 2025-08-08 · 15:49:01.000Z | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 271000000 | USD | 2025-08-08 · 15:49:01.000Z | Open filing evidence |
| 2025-01-01 – 2025-03-31 | 135000000 | USD | 2026-05-01 · 15:07:49.000Z | Open filing evidence |
| 2024-01-01 – 2024-12-31 | 525000000 | USD | 2026-02-20 · 19:58:00.000Z | Open filing evidence |
| 2024-07-01 – 2024-09-30 | 153000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
| 2024-01-01 – 2024-09-30 | 385000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
| 2024-04-01 – 2024-06-30 | 118000000 | USD | 2025-08-08 · 15:49:01.000Z | Open filing evidence |
| 2024-01-01 – 2024-06-30 | 232000000 | USD | 2025-08-08 · 15:49:01.000Z | Open filing evidence |
Retail Commercial · Ipl · Gas
Major Customers · Legal Entity · Statement Business Segments
Source dimensions
srt:MajorCustomersAxis=lnt:RetailCommercialMember;dei:LegalEntityAxis=lnt:IplMember;us-gaap:StatementBusinessSegmentsAxis=lnt:GasMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-01-01 – 2026-03-31 | 35000000 | USD | 2026-05-01 · 15:07:49.000Z | Open filing evidence |
| 2025-01-01 – 2025-12-31 | 72000000 | USD | 2026-02-20 · 19:58:00.000Z | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 7000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 49000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 10000000 | USD | 2025-08-08 · 15:49:01.000Z | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 43000000 | USD | 2025-08-08 · 15:49:01.000Z | Open filing evidence |
| 2025-01-01 – 2025-03-31 | 32000000 | USD | 2026-05-01 · 15:07:49.000Z | Open filing evidence |
| 2024-01-01 – 2024-12-31 | 68000000 | USD | 2026-02-20 · 19:58:00.000Z | Open filing evidence |
| 2024-07-01 – 2024-09-30 | 7000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
| 2024-01-01 – 2024-09-30 | 48000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
| 2024-04-01 – 2024-06-30 | 11000000 | USD | 2025-08-08 · 15:49:01.000Z | Open filing evidence |
| 2024-01-01 – 2024-06-30 | 41000000 | USD | 2025-08-08 · 15:49:01.000Z | Open filing evidence |
Retail Commercial · Wpl · Electric
Major Customers · Legal Entity · Statement Business Segments
Source dimensions
srt:MajorCustomersAxis=lnt:RetailCommercialMember;dei:LegalEntityAxis=lnt:WplMember;us-gaap:StatementBusinessSegmentsAxis=lnt:ElectricMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-01-01 – 2026-03-31 | 79000000 | USD | 2026-05-01 · 15:07:49.000Z | Open filing evidence |
| 2025-01-01 – 2025-12-31 | 323000000 | USD | 2026-02-20 · 19:58:00.000Z | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 90000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 243000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 76000000 | USD | 2025-08-08 · 15:49:01.000Z | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 154000000 | USD | 2025-08-08 · 15:49:01.000Z | Open filing evidence |
| 2025-01-01 – 2025-03-31 | 78000000 | USD | 2026-05-01 · 15:07:49.000Z | Open filing evidence |
| 2024-01-01 – 2024-12-31 | 296000000 | USD | 2026-02-20 · 19:58:00.000Z | Open filing evidence |
| 2024-07-01 – 2024-09-30 | 86000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
| 2024-01-01 – 2024-09-30 | 231000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
| 2024-04-01 – 2024-06-30 | 73000000 | USD | 2025-08-08 · 15:49:01.000Z | Open filing evidence |
| 2024-01-01 – 2024-06-30 | 145000000 | USD | 2025-08-08 · 15:49:01.000Z | Open filing evidence |
Retail Commercial · Wpl · Gas
Major Customers · Legal Entity · Statement Business Segments
Source dimensions
srt:MajorCustomersAxis=lnt:RetailCommercialMember;dei:LegalEntityAxis=lnt:WplMember;us-gaap:StatementBusinessSegmentsAxis=lnt:GasMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-01-01 – 2026-03-31 | 51000000 | USD | 2026-05-01 · 15:07:49.000Z | Open filing evidence |
| 2025-01-01 – 2025-12-31 | 81000000 | USD | 2026-02-20 · 19:58:00.000Z | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 6000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 57000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 10000000 | USD | 2025-08-08 · 15:49:01.000Z | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 51000000 | USD | 2025-08-08 · 15:49:01.000Z | Open filing evidence |
| 2025-01-01 – 2025-03-31 | 41000000 | USD | 2026-05-01 · 15:07:49.000Z | Open filing evidence |
| 2024-01-01 – 2024-12-31 | 65000000 | USD | 2026-02-20 · 19:58:00.000Z | Open filing evidence |
| 2024-07-01 – 2024-09-30 | 6000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
| 2024-01-01 – 2024-09-30 | 44000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
| 2024-04-01 – 2024-06-30 | 8000000 | USD | 2025-08-08 · 15:49:01.000Z | Open filing evidence |
| 2024-01-01 – 2024-06-30 | 39000000 | USD | 2025-08-08 · 15:49:01.000Z | Open filing evidence |
Retail Commercial · Electric
Major Customers · Statement Business Segments
Source dimensions
srt:MajorCustomersAxis=lnt:RetailCommercialMember;us-gaap:StatementBusinessSegmentsAxis=lnt:ElectricMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-07-01 – 2026-09-30 | 294000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2026-01-01 – 2026-09-30 | 736000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2026-04-01 – 2026-06-30 | 221000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2026-01-01 – 2026-06-30 | 442000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2026-01-01 – 2026-03-31 | 221000000 | USD | 2026-05-01 · 15:07:49.000Z | Open filing evidence |
| 2025-01-01 – 2025-12-31 | 932000000 | USD | 2026-02-20 · 19:58:00.000Z | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 282000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 705000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 211000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 425000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2025-01-01 – 2025-03-31 | 213000000 | USD | 2026-05-01 · 15:07:49.000Z | Open filing evidence |
| 2024-01-01 – 2024-12-31 | 821000000 | USD | 2026-02-20 · 19:58:00.000Z | Open filing evidence |
| 2024-07-01 – 2024-09-30 | 239000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
| 2024-01-01 – 2024-09-30 | 616000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
| 2024-04-01 – 2024-06-30 | 191000000 | USD | 2025-08-08 · 15:49:01.000Z | Open filing evidence |
| 2024-01-01 – 2024-06-30 | 377000000 | USD | 2025-08-08 · 15:49:01.000Z | Open filing evidence |
Retail Commercial · Electric · Ipl
Major Customers · Statement Business Segments · Legal Entity
Source dimensions
srt:MajorCustomersAxis=lnt:RetailCommercialMember;us-gaap:StatementBusinessSegmentsAxis=lnt:ElectricMember;dei:LegalEntityAxis=lnt:IplMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-07-01 – 2026-09-30 | 200000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2026-01-01 – 2026-09-30 | 485000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2026-04-01 – 2026-06-30 | 143000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2026-01-01 – 2026-06-30 | 285000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 192000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 462000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 135000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 271000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
Retail Commercial · Electric · Wpl
Major Customers · Statement Business Segments · Legal Entity
Source dimensions
srt:MajorCustomersAxis=lnt:RetailCommercialMember;us-gaap:StatementBusinessSegmentsAxis=lnt:ElectricMember;dei:LegalEntityAxis=lnt:WplMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-07-01 – 2026-09-30 | 94000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2026-01-01 – 2026-09-30 | 251000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2026-04-01 – 2026-06-30 | 78000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2026-01-01 – 2026-06-30 | 157000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 90000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 243000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 76000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 154000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2024-04-01 – 2024-06-30 | 73000000 | USD | 2024-08-02 · 15:51:55.000Z | Open filing evidence |
| 2024-01-01 – 2024-06-30 | 145000000 | USD | 2024-08-02 · 15:51:55.000Z | Open filing evidence |
Retail Commercial · Gas
Major Customers · Statement Business Segments
Source dimensions
srt:MajorCustomersAxis=lnt:RetailCommercialMember;us-gaap:StatementBusinessSegmentsAxis=lnt:GasMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-07-01 – 2026-09-30 | 13000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2026-01-01 – 2026-09-30 | 124000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2026-04-01 – 2026-06-30 | 25000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2026-01-01 – 2026-06-30 | 111000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2026-01-01 – 2026-03-31 | 86000000 | USD | 2026-05-01 · 15:07:49.000Z | Open filing evidence |
| 2025-01-01 – 2025-12-31 | 153000000 | USD | 2026-02-20 · 19:58:00.000Z | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 13000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 106000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 20000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 94000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2025-01-01 – 2025-03-31 | 73000000 | USD | 2026-05-01 · 15:07:49.000Z | Open filing evidence |
| 2024-01-01 – 2024-12-31 | 133000000 | USD | 2026-02-20 · 19:58:00.000Z | Open filing evidence |
| 2024-07-01 – 2024-09-30 | 13000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
| 2024-01-01 – 2024-09-30 | 92000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
| 2024-04-01 – 2024-06-30 | 19000000 | USD | 2025-08-08 · 15:49:01.000Z | Open filing evidence |
| 2024-01-01 – 2024-06-30 | 80000000 | USD | 2025-08-08 · 15:49:01.000Z | Open filing evidence |
Retail Commercial · Gas · Ipl
Major Customers · Statement Business Segments · Legal Entity
Source dimensions
srt:MajorCustomersAxis=lnt:RetailCommercialMember;us-gaap:StatementBusinessSegmentsAxis=lnt:GasMember;dei:LegalEntityAxis=lnt:IplMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-07-01 – 2026-09-30 | 8000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2026-01-01 – 2026-09-30 | 56000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2026-04-01 – 2026-06-30 | 13000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2026-01-01 – 2026-06-30 | 48000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 7000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 49000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 10000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 43000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2024-04-01 – 2024-06-30 | 11000000 | USD | 2024-08-02 · 15:51:55.000Z | Open filing evidence |
| 2024-01-01 – 2024-06-30 | 41000000 | USD | 2024-08-02 · 15:51:55.000Z | Open filing evidence |
Retail Commercial · Gas · Wpl
Major Customers · Statement Business Segments · Legal Entity
Source dimensions
srt:MajorCustomersAxis=lnt:RetailCommercialMember;us-gaap:StatementBusinessSegmentsAxis=lnt:GasMember;dei:LegalEntityAxis=lnt:WplMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-07-01 – 2026-09-30 | 5000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2026-01-01 – 2026-09-30 | 68000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2026-04-01 – 2026-06-30 | 12000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2026-01-01 – 2026-06-30 | 63000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 6000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 57000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 10000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 51000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2024-04-01 – 2024-06-30 | 8000000 | USD | 2024-08-02 · 15:51:55.000Z | Open filing evidence |
| 2024-01-01 – 2024-06-30 | 39000000 | USD | 2024-08-02 · 15:51:55.000Z | Open filing evidence |
Retail Industrial · Ipl · Electric
Major Customers · Legal Entity · Statement Business Segments
Source dimensions
srt:MajorCustomersAxis=lnt:RetailIndustrialMember;dei:LegalEntityAxis=lnt:IplMember;us-gaap:StatementBusinessSegmentsAxis=lnt:ElectricMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-01-01 – 2026-03-31 | 123000000 | USD | 2026-05-01 · 15:07:49.000Z | Open filing evidence |
| 2025-01-01 – 2025-12-31 | 531000000 | USD | 2026-02-20 · 19:58:00.000Z | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 167000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 403000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 118000000 | USD | 2025-08-08 · 15:49:01.000Z | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 236000000 | USD | 2025-08-08 · 15:49:01.000Z | Open filing evidence |
| 2025-01-01 – 2025-03-31 | 119000000 | USD | 2026-05-01 · 15:07:49.000Z | Open filing evidence |
| 2024-01-01 – 2024-12-31 | 497000000 | USD | 2026-02-20 · 19:58:00.000Z | Open filing evidence |
| 2024-07-01 – 2024-09-30 | 142000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
| 2024-01-01 – 2024-09-30 | 372000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
| 2024-04-01 – 2024-06-30 | 118000000 | USD | 2025-08-08 · 15:49:01.000Z | Open filing evidence |
| 2024-01-01 – 2024-06-30 | 229000000 | USD | 2025-08-08 · 15:49:01.000Z | Open filing evidence |
Retail Industrial · Ipl · Gas
Major Customers · Legal Entity · Statement Business Segments
Source dimensions
srt:MajorCustomersAxis=lnt:RetailIndustrialMember;dei:LegalEntityAxis=lnt:IplMember;us-gaap:StatementBusinessSegmentsAxis=lnt:GasMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-01-01 – 2026-03-31 | 3000000 | USD | 2026-05-01 · 15:07:49.000Z | Open filing evidence |
| 2025-01-01 – 2025-12-31 | 7000000 | USD | 2026-02-20 · 19:58:00.000Z | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 1000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 6000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 2000000 | USD | 2025-08-08 · 15:49:01.000Z | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 4000000 | USD | 2025-08-08 · 15:49:01.000Z | Open filing evidence |
| 2025-01-01 – 2025-03-31 | 3000000 | USD | 2026-05-01 · 15:07:49.000Z | Open filing evidence |
| 2024-01-01 – 2024-12-31 | 7000000 | USD | 2026-02-20 · 19:58:00.000Z | Open filing evidence |
| 2024-07-01 – 2024-09-30 | 1000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
| 2024-01-01 – 2024-09-30 | 5000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
| 2024-04-01 – 2024-06-30 | 1000000 | USD | 2025-08-08 · 15:49:01.000Z | Open filing evidence |
| 2024-01-01 – 2024-06-30 | 4000000 | USD | 2025-08-08 · 15:49:01.000Z | Open filing evidence |
Retail Industrial · Wpl · Electric
Major Customers · Legal Entity · Statement Business Segments
Source dimensions
srt:MajorCustomersAxis=lnt:RetailIndustrialMember;dei:LegalEntityAxis=lnt:WplMember;us-gaap:StatementBusinessSegmentsAxis=lnt:ElectricMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-01-01 – 2026-03-31 | 117000000 | USD | 2026-05-01 · 15:07:49.000Z | Open filing evidence |
| 2025-01-01 – 2025-12-31 | 503000000 | USD | 2026-02-20 · 19:58:00.000Z | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 139000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 379000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 122000000 | USD | 2025-08-08 · 15:49:01.000Z | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 239000000 | USD | 2025-08-08 · 15:49:01.000Z | Open filing evidence |
| 2025-01-01 – 2025-03-31 | 118000000 | USD | 2026-05-01 · 15:07:49.000Z | Open filing evidence |
| 2024-01-01 – 2024-12-31 | 455000000 | USD | 2026-02-20 · 19:58:00.000Z | Open filing evidence |
| 2024-07-01 – 2024-09-30 | 128000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
| 2024-01-01 – 2024-09-30 | 358000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
| 2024-04-01 – 2024-06-30 | 119000000 | USD | 2025-08-08 · 15:49:01.000Z | Open filing evidence |
| 2024-01-01 – 2024-06-30 | 231000000 | USD | 2025-08-08 · 15:49:01.000Z | Open filing evidence |
Retail Industrial · Wpl · Gas
Major Customers · Legal Entity · Statement Business Segments
Source dimensions
srt:MajorCustomersAxis=lnt:RetailIndustrialMember;dei:LegalEntityAxis=lnt:WplMember;us-gaap:StatementBusinessSegmentsAxis=lnt:GasMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-01-01 – 2026-03-31 | 4000000 | USD | 2026-05-01 · 15:07:49.000Z | Open filing evidence |
| 2025-01-01 – 2025-12-31 | 6000000 | USD | 2026-02-20 · 19:58:00.000Z | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 0 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 4000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 1000000 | USD | 2025-08-08 · 15:49:01.000Z | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 4000000 | USD | 2025-08-08 · 15:49:01.000Z | Open filing evidence |
| 2025-01-01 – 2025-03-31 | 3000000 | USD | 2026-05-01 · 15:07:49.000Z | Open filing evidence |
| 2024-01-01 – 2024-12-31 | 4000000 | USD | 2026-02-20 · 19:58:00.000Z | Open filing evidence |
| 2024-07-01 – 2024-09-30 | 0 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
| 2024-01-01 – 2024-09-30 | 3000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
| 2024-04-01 – 2024-06-30 | 1000000 | USD | 2025-08-08 · 15:49:01.000Z | Open filing evidence |
| 2024-01-01 – 2024-06-30 | 2000000 | USD | 2025-08-08 · 15:49:01.000Z | Open filing evidence |
Retail Industrial · Electric
Major Customers · Statement Business Segments
Source dimensions
srt:MajorCustomersAxis=lnt:RetailIndustrialMember;us-gaap:StatementBusinessSegmentsAxis=lnt:ElectricMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-07-01 – 2026-09-30 | 318000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2026-01-01 – 2026-09-30 | 809000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2026-04-01 – 2026-06-30 | 251000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2026-01-01 – 2026-06-30 | 491000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2026-01-01 – 2026-03-31 | 240000000 | USD | 2026-05-01 · 15:07:49.000Z | Open filing evidence |
| 2025-01-01 – 2025-12-31 | 1034000000 | USD | 2026-02-20 · 19:58:00.000Z | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 306000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 782000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 240000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 475000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2025-01-01 – 2025-03-31 | 237000000 | USD | 2026-05-01 · 15:07:49.000Z | Open filing evidence |
| 2024-01-01 – 2024-12-31 | 952000000 | USD | 2026-02-20 · 19:58:00.000Z | Open filing evidence |
| 2024-07-01 – 2024-09-30 | 270000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
| 2024-01-01 – 2024-09-30 | 730000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
| 2024-04-01 – 2024-06-30 | 237000000 | USD | 2025-08-08 · 15:49:01.000Z | Open filing evidence |
| 2024-01-01 – 2024-06-30 | 460000000 | USD | 2025-08-08 · 15:49:01.000Z | Open filing evidence |
Retail Industrial · Electric · Ipl
Major Customers · Statement Business Segments · Legal Entity
Source dimensions
srt:MajorCustomersAxis=lnt:RetailIndustrialMember;us-gaap:StatementBusinessSegmentsAxis=lnt:ElectricMember;dei:LegalEntityAxis=lnt:IplMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-07-01 – 2026-09-30 | 173000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2026-01-01 – 2026-09-30 | 422000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2026-04-01 – 2026-06-30 | 126000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2026-01-01 – 2026-06-30 | 249000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 167000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 403000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 118000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 236000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
Retail Industrial · Electric · Wpl
Major Customers · Statement Business Segments · Legal Entity
Source dimensions
srt:MajorCustomersAxis=lnt:RetailIndustrialMember;us-gaap:StatementBusinessSegmentsAxis=lnt:ElectricMember;dei:LegalEntityAxis=lnt:WplMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-07-01 – 2026-09-30 | 145000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2026-01-01 – 2026-09-30 | 387000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2026-04-01 – 2026-06-30 | 125000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2026-01-01 – 2026-06-30 | 242000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 139000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 379000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 122000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 239000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2024-04-01 – 2024-06-30 | 119000000 | USD | 2024-08-02 · 15:51:55.000Z | Open filing evidence |
| 2024-01-01 – 2024-06-30 | 231000000 | USD | 2024-08-02 · 15:51:55.000Z | Open filing evidence |
Retail Industrial · Gas
Major Customers · Statement Business Segments
Source dimensions
srt:MajorCustomersAxis=lnt:RetailIndustrialMember;us-gaap:StatementBusinessSegmentsAxis=lnt:GasMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-07-01 – 2026-09-30 | 1000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2026-01-01 – 2026-09-30 | 11000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2026-04-01 – 2026-06-30 | 3000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2026-01-01 – 2026-06-30 | 9000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2026-01-01 – 2026-03-31 | 7000000 | USD | 2026-05-01 · 15:07:49.000Z | Open filing evidence |
| 2025-01-01 – 2025-12-31 | 13000000 | USD | 2026-02-20 · 19:58:00.000Z | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 1000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 10000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 3000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 8000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2025-01-01 – 2025-03-31 | 6000000 | USD | 2026-05-01 · 15:07:49.000Z | Open filing evidence |
| 2024-01-01 – 2024-12-31 | 11000000 | USD | 2026-02-20 · 19:58:00.000Z | Open filing evidence |
| 2024-07-01 – 2024-09-30 | 1000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
| 2024-01-01 – 2024-09-30 | 8000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
| 2024-04-01 – 2024-06-30 | 2000000 | USD | 2025-08-08 · 15:49:01.000Z | Open filing evidence |
| 2024-01-01 – 2024-06-30 | 6000000 | USD | 2025-08-08 · 15:49:01.000Z | Open filing evidence |
Retail Industrial · Gas · Ipl
Major Customers · Statement Business Segments · Legal Entity
Source dimensions
srt:MajorCustomersAxis=lnt:RetailIndustrialMember;us-gaap:StatementBusinessSegmentsAxis=lnt:GasMember;dei:LegalEntityAxis=lnt:IplMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-07-01 – 2026-09-30 | 1000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2026-01-01 – 2026-09-30 | 6000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2026-04-01 – 2026-06-30 | 2000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2026-01-01 – 2026-06-30 | 4000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 1000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 6000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 2000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 4000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
Retail Industrial · Gas · Wpl
Major Customers · Statement Business Segments · Legal Entity
Source dimensions
srt:MajorCustomersAxis=lnt:RetailIndustrialMember;us-gaap:StatementBusinessSegmentsAxis=lnt:GasMember;dei:LegalEntityAxis=lnt:WplMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-07-01 – 2026-09-30 | 0 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2026-01-01 – 2026-09-30 | 5000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2026-04-01 – 2026-06-30 | 1000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2026-01-01 – 2026-06-30 | 5000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 0 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 4000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 1000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 4000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
Retail Residential · Ipl · Electric
Major Customers · Legal Entity · Statement Business Segments
Source dimensions
srt:MajorCustomersAxis=lnt:RetailResidentialMember;dei:LegalEntityAxis=lnt:IplMember;us-gaap:StatementBusinessSegmentsAxis=lnt:ElectricMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-01-01 – 2026-03-31 | 160000000 | USD | 2026-05-01 · 15:07:49.000Z | Open filing evidence |
| 2025-01-01 – 2025-12-31 | 661000000 | USD | 2026-02-20 · 19:58:00.000Z | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 215000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 512000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 142000000 | USD | 2025-08-08 · 15:49:01.000Z | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 297000000 | USD | 2025-08-08 · 15:49:01.000Z | Open filing evidence |
| 2025-01-01 – 2025-03-31 | 155000000 | USD | 2026-05-01 · 15:07:49.000Z | Open filing evidence |
| 2024-01-01 – 2024-12-31 | 640000000 | USD | 2026-02-20 · 19:58:00.000Z | Open filing evidence |
| 2024-07-01 – 2024-09-30 | 202000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
| 2024-01-01 – 2024-09-30 | 502000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
| 2024-04-01 – 2024-06-30 | 151000000 | USD | 2025-08-08 · 15:49:01.000Z | Open filing evidence |
| 2024-01-01 – 2024-06-30 | 301000000 | USD | 2025-08-08 · 15:49:01.000Z | Open filing evidence |
Retail Residential · Ipl · Gas
Major Customers · Legal Entity · Statement Business Segments
Source dimensions
srt:MajorCustomersAxis=lnt:RetailResidentialMember;dei:LegalEntityAxis=lnt:IplMember;us-gaap:StatementBusinessSegmentsAxis=lnt:GasMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-01-01 – 2026-03-31 | 75000000 | USD | 2026-05-01 · 15:07:49.000Z | Open filing evidence |
| 2025-01-01 – 2025-12-31 | 155000000 | USD | 2026-02-20 · 19:58:00.000Z | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 12000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 107000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 21000000 | USD | 2025-08-08 · 15:49:01.000Z | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 95000000 | USD | 2025-08-08 · 15:49:01.000Z | Open filing evidence |
| 2025-01-01 – 2025-03-31 | 73000000 | USD | 2026-05-01 · 15:07:49.000Z | Open filing evidence |
| 2024-01-01 – 2024-12-31 | 148000000 | USD | 2026-02-20 · 19:58:00.000Z | Open filing evidence |
| 2024-07-01 – 2024-09-30 | 13000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
| 2024-01-01 – 2024-09-30 | 103000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
| 2024-04-01 – 2024-06-30 | 22000000 | USD | 2025-08-08 · 15:49:01.000Z | Open filing evidence |
| 2024-01-01 – 2024-06-30 | 90000000 | USD | 2025-08-08 · 15:49:01.000Z | Open filing evidence |
Retail Residential · Wpl · Electric
Major Customers · Legal Entity · Statement Business Segments
Source dimensions
srt:MajorCustomersAxis=lnt:RetailResidentialMember;dei:LegalEntityAxis=lnt:WplMember;us-gaap:StatementBusinessSegmentsAxis=lnt:ElectricMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-01-01 – 2026-03-31 | 172000000 | USD | 2026-05-01 · 15:07:49.000Z | Open filing evidence |
| 2025-01-01 – 2025-12-31 | 678000000 | USD | 2026-02-20 · 19:58:00.000Z | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 193000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 515000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 153000000 | USD | 2025-08-08 · 15:49:01.000Z | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 321000000 | USD | 2025-08-08 · 15:49:01.000Z | Open filing evidence |
| 2025-01-01 – 2025-03-31 | 168000000 | USD | 2026-05-01 · 15:07:49.000Z | Open filing evidence |
| 2024-01-01 – 2024-12-31 | 596000000 | USD | 2026-02-20 · 19:58:00.000Z | Open filing evidence |
| 2024-07-01 – 2024-09-30 | 176000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
| 2024-01-01 – 2024-09-30 | 464000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
| 2024-04-01 – 2024-06-30 | 140000000 | USD | 2025-08-08 · 15:49:01.000Z | Open filing evidence |
| 2024-01-01 – 2024-06-30 | 287000000 | USD | 2025-08-08 · 15:49:01.000Z | Open filing evidence |
Retail Residential · Wpl · Gas
Major Customers · Legal Entity · Statement Business Segments
Source dimensions
srt:MajorCustomersAxis=lnt:RetailResidentialMember;dei:LegalEntityAxis=lnt:WplMember;us-gaap:StatementBusinessSegmentsAxis=lnt:GasMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-01-01 – 2026-03-31 | 87000000 | USD | 2026-05-01 · 15:07:49.000Z | Open filing evidence |
| 2025-01-01 – 2025-12-31 | 151000000 | USD | 2026-02-20 · 19:58:00.000Z | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 12000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 104000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 20000000 | USD | 2025-08-08 · 15:49:01.000Z | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 93000000 | USD | 2025-08-08 · 15:49:01.000Z | Open filing evidence |
| 2025-01-01 – 2025-03-31 | 72000000 | USD | 2026-05-01 · 15:07:49.000Z | Open filing evidence |
| 2024-01-01 – 2024-12-31 | 127000000 | USD | 2026-02-20 · 19:58:00.000Z | Open filing evidence |
| 2024-07-01 – 2024-09-30 | 11000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
| 2024-01-01 – 2024-09-30 | 86000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
| 2024-04-01 – 2024-06-30 | 16000000 | USD | 2025-08-08 · 15:49:01.000Z | Open filing evidence |
| 2024-01-01 – 2024-06-30 | 75000000 | USD | 2025-08-08 · 15:49:01.000Z | Open filing evidence |
Retail Residential · Electric
Major Customers · Statement Business Segments
Source dimensions
srt:MajorCustomersAxis=lnt:RetailResidentialMember;us-gaap:StatementBusinessSegmentsAxis=lnt:ElectricMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-07-01 – 2026-09-30 | 443000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2026-01-01 – 2026-09-30 | 1085000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2026-04-01 – 2026-06-30 | 309000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2026-01-01 – 2026-06-30 | 641000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2026-01-01 – 2026-03-31 | 332000000 | USD | 2026-05-01 · 15:07:49.000Z | Open filing evidence |
| 2025-01-01 – 2025-12-31 | 1339000000 | USD | 2026-02-20 · 19:58:00.000Z | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 408000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 1027000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 295000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 618000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2025-01-01 – 2025-03-31 | 323000000 | USD | 2026-05-01 · 15:07:49.000Z | Open filing evidence |
| 2024-01-01 – 2024-12-31 | 1236000000 | USD | 2026-02-20 · 19:58:00.000Z | Open filing evidence |
| 2024-07-01 – 2024-09-30 | 378000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
| 2024-01-01 – 2024-09-30 | 966000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
| 2024-04-01 – 2024-06-30 | 291000000 | USD | 2025-08-08 · 15:49:01.000Z | Open filing evidence |
| 2024-01-01 – 2024-06-30 | 588000000 | USD | 2025-08-08 · 15:49:01.000Z | Open filing evidence |
Retail Residential · Electric · Ipl
Major Customers · Statement Business Segments · Legal Entity
Source dimensions
srt:MajorCustomersAxis=lnt:RetailResidentialMember;us-gaap:StatementBusinessSegmentsAxis=lnt:ElectricMember;dei:LegalEntityAxis=lnt:IplMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-07-01 – 2026-09-30 | 233000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2026-01-01 – 2026-09-30 | 545000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2026-04-01 – 2026-06-30 | 151000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2026-01-01 – 2026-06-30 | 311000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 215000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 512000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 142000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 297000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
Retail Residential · Electric · Wpl
Major Customers · Statement Business Segments · Legal Entity
Source dimensions
srt:MajorCustomersAxis=lnt:RetailResidentialMember;us-gaap:StatementBusinessSegmentsAxis=lnt:ElectricMember;dei:LegalEntityAxis=lnt:WplMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-07-01 – 2026-09-30 | 210000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2026-01-01 – 2026-09-30 | 540000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2026-04-01 – 2026-06-30 | 158000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2026-01-01 – 2026-06-30 | 330000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 193000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 515000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 153000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 321000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
Retail Residential · Gas
Major Customers · Statement Business Segments
Source dimensions
srt:MajorCustomersAxis=lnt:RetailResidentialMember;us-gaap:StatementBusinessSegmentsAxis=lnt:GasMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-07-01 – 2026-09-30 | 26000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2026-01-01 – 2026-09-30 | 232000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2026-04-01 – 2026-06-30 | 44000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2026-01-01 – 2026-06-30 | 206000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2026-01-01 – 2026-03-31 | 162000000 | USD | 2026-05-01 · 15:07:49.000Z | Open filing evidence |
| 2025-01-01 – 2025-12-31 | 306000000 | USD | 2026-02-20 · 19:58:00.000Z | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 24000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 211000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 41000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 188000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2025-01-01 – 2025-03-31 | 145000000 | USD | 2026-05-01 · 15:07:49.000Z | Open filing evidence |
| 2024-01-01 – 2024-12-31 | 275000000 | USD | 2026-02-20 · 19:58:00.000Z | Open filing evidence |
| 2024-07-01 – 2024-09-30 | 24000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
| 2024-01-01 – 2024-09-30 | 189000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
Retail Residential · Gas · Ipl
Major Customers · Statement Business Segments · Legal Entity
Source dimensions
srt:MajorCustomersAxis=lnt:RetailResidentialMember;us-gaap:StatementBusinessSegmentsAxis=lnt:GasMember;dei:LegalEntityAxis=lnt:IplMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-07-01 – 2026-09-30 | 14000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2026-01-01 – 2026-09-30 | 113000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2026-04-01 – 2026-06-30 | 23000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2026-01-01 – 2026-06-30 | 99000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 12000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 107000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 21000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 95000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
Retail Residential · Gas · Wpl
Major Customers · Statement Business Segments · Legal Entity
Source dimensions
srt:MajorCustomersAxis=lnt:RetailResidentialMember;us-gaap:StatementBusinessSegmentsAxis=lnt:GasMember;dei:LegalEntityAxis=lnt:WplMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-07-01 – 2026-09-30 | 12000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2026-01-01 – 2026-09-30 | 119000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2026-04-01 – 2026-06-30 | 21000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2026-01-01 – 2026-06-30 | 107000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 12000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 104000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 20000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 93000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
Steam · Ipl · Other Utility
Major Customers · Legal Entity · Statement Business Segments
Source dimensions
srt:MajorCustomersAxis=lnt:SteamMember;dei:LegalEntityAxis=lnt:IplMember;us-gaap:StatementBusinessSegmentsAxis=lnt:OtherUtilityMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-01-01 – 2026-03-31 | 0 | USD | 2026-05-01 · 15:07:49.000Z | Open filing evidence |
| 2025-01-01 – 2025-12-31 | 37000000 | USD | 2026-02-20 · 19:58:00.000Z | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 9000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 28000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 9000000 | USD | 2025-08-08 · 15:49:01.000Z | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 19000000 | USD | 2025-08-08 · 15:49:01.000Z | Open filing evidence |
| 2025-01-01 – 2025-03-31 | 10000000 | USD | 2026-05-01 · 15:07:49.000Z | Open filing evidence |
| 2024-01-01 – 2024-12-31 | 40000000 | USD | 2026-02-20 · 19:58:00.000Z | Open filing evidence |
| 2024-07-01 – 2024-09-30 | 9000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
| 2024-01-01 – 2024-09-30 | 29000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
Steam · Other Utility
Major Customers · Statement Business Segments
Source dimensions
srt:MajorCustomersAxis=lnt:SteamMember;us-gaap:StatementBusinessSegmentsAxis=lnt:OtherUtilityMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-07-01 – 2026-09-30 | 0 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2026-01-01 – 2026-09-30 | 0 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2026-04-01 – 2026-06-30 | 0 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2026-01-01 – 2026-06-30 | 0 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2026-01-01 – 2026-03-31 | 0 | USD | 2026-05-01 · 15:07:49.000Z | Open filing evidence |
| 2025-01-01 – 2025-12-31 | 37000000 | USD | 2026-02-20 · 19:58:00.000Z | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 9000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 28000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 9000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 19000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2025-01-01 – 2025-03-31 | 10000000 | USD | 2026-05-01 · 15:07:49.000Z | Open filing evidence |
| 2024-01-01 – 2024-12-31 | 40000000 | USD | 2026-02-20 · 19:58:00.000Z | Open filing evidence |
| 2024-07-01 – 2024-09-30 | 9000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
| 2024-01-01 – 2024-09-30 | 29000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
Steam · Other Utility · Ipl
Major Customers · Statement Business Segments · Legal Entity
Source dimensions
srt:MajorCustomersAxis=lnt:SteamMember;us-gaap:StatementBusinessSegmentsAxis=lnt:OtherUtilityMember;dei:LegalEntityAxis=lnt:IplMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-07-01 – 2026-09-30 | 0 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2026-01-01 – 2026-09-30 | 0 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2026-04-01 – 2026-06-30 | 0 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2026-01-01 – 2026-06-30 | 0 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 9000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 28000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 9000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 19000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
Wholesale · Ipl · Electric
Major Customers · Legal Entity · Statement Business Segments
Source dimensions
srt:MajorCustomersAxis=lnt:WholesaleMember;dei:LegalEntityAxis=lnt:IplMember;us-gaap:StatementBusinessSegmentsAxis=lnt:ElectricMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-01-01 – 2026-03-31 | 0 | USD | 2026-05-01 · 15:07:49.000Z | Open filing evidence |
| 2025-01-01 – 2025-12-31 | 39000000 | USD | 2026-02-20 · 19:58:00.000Z | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 11000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 39000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 14000000 | USD | 2025-08-08 · 15:49:01.000Z | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 28000000 | USD | 2025-08-08 · 15:49:01.000Z | Open filing evidence |
| 2025-01-01 – 2025-03-31 | 14000000 | USD | 2026-05-01 · 15:07:49.000Z | Open filing evidence |
| 2024-01-01 – 2024-12-31 | 61000000 | USD | 2026-02-20 · 19:58:00.000Z | Open filing evidence |
| 2024-07-01 – 2024-09-30 | 19000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
| 2024-01-01 – 2024-09-30 | 45000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
Wholesale · Wpl · Electric
Major Customers · Legal Entity · Statement Business Segments
Source dimensions
srt:MajorCustomersAxis=lnt:WholesaleMember;dei:LegalEntityAxis=lnt:WplMember;us-gaap:StatementBusinessSegmentsAxis=lnt:ElectricMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-01-01 – 2026-03-31 | 35000000 | USD | 2026-05-01 · 15:07:49.000Z | Open filing evidence |
| 2025-01-01 – 2025-12-31 | 145000000 | USD | 2026-02-20 · 19:58:00.000Z | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 40000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 109000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 35000000 | USD | 2025-08-08 · 15:49:01.000Z | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 69000000 | USD | 2025-08-08 · 15:49:01.000Z | Open filing evidence |
| 2025-01-01 – 2025-03-31 | 34000000 | USD | 2026-05-01 · 15:07:49.000Z | Open filing evidence |
| 2024-01-01 – 2024-12-31 | 139000000 | USD | 2026-02-20 · 19:58:00.000Z | Open filing evidence |
| 2024-07-01 – 2024-09-30 | 39000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
| 2024-01-01 – 2024-09-30 | 102000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
Wholesale · Electric
Major Customers · Statement Business Segments
Source dimensions
srt:MajorCustomersAxis=lnt:WholesaleMember;us-gaap:StatementBusinessSegmentsAxis=lnt:ElectricMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-07-01 – 2026-09-30 | 45000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2026-01-01 – 2026-09-30 | 115000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2026-04-01 – 2026-06-30 | 36000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2026-01-01 – 2026-06-30 | 71000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2026-01-01 – 2026-03-31 | 35000000 | USD | 2026-05-01 · 15:07:49.000Z | Open filing evidence |
| 2025-01-01 – 2025-12-31 | 184000000 | USD | 2026-02-20 · 19:58:00.000Z | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 51000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 148000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 49000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 97000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2025-01-01 – 2025-03-31 | 48000000 | USD | 2026-05-01 · 15:07:49.000Z | Open filing evidence |
| 2024-01-01 – 2024-12-31 | 200000000 | USD | 2026-02-20 · 19:58:00.000Z | Open filing evidence |
| 2024-07-01 – 2024-09-30 | 58000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
| 2024-01-01 – 2024-09-30 | 147000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
Wholesale · Electric · Ipl
Major Customers · Statement Business Segments · Legal Entity
Source dimensions
srt:MajorCustomersAxis=lnt:WholesaleMember;us-gaap:StatementBusinessSegmentsAxis=lnt:ElectricMember;dei:LegalEntityAxis=lnt:IplMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-07-01 – 2026-09-30 | 3000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2026-01-01 – 2026-09-30 | 3000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2026-04-01 – 2026-06-30 | 0 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2026-01-01 – 2026-06-30 | 0 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 11000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 39000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 14000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 28000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
Wholesale · Electric · Wpl
Major Customers · Statement Business Segments · Legal Entity
Source dimensions
srt:MajorCustomersAxis=lnt:WholesaleMember;us-gaap:StatementBusinessSegmentsAxis=lnt:ElectricMember;dei:LegalEntityAxis=lnt:WplMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-07-01 – 2026-09-30 | 42000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2026-01-01 – 2026-09-30 | 112000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2026-04-01 – 2026-06-30 | 36000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2026-01-01 – 2026-06-30 | 71000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 40000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 109000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 35000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 69000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
Other Customer · Ipl · Electric
Major Customers · Legal Entity · Statement Business Segments
Source dimensions
srt:MajorCustomersAxis=us-gaap:OtherCustomerMember;dei:LegalEntityAxis=lnt:IplMember;us-gaap:StatementBusinessSegmentsAxis=lnt:ElectricMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-01-01 – 2026-03-31 | 12000000 | USD | 2026-05-01 · 15:07:49.000Z | Open filing evidence |
| 2025-01-01 – 2025-12-31 | 56000000 | USD | 2026-02-20 · 19:58:00.000Z | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 23000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 39000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 9000000 | USD | 2025-08-08 · 15:49:01.000Z | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 16000000 | USD | 2025-08-08 · 15:49:01.000Z | Open filing evidence |
| 2025-01-01 – 2025-03-31 | 7000000 | USD | 2026-05-01 · 15:07:49.000Z | Open filing evidence |
| 2024-01-01 – 2024-12-31 | 24000000 | USD | 2026-02-20 · 19:58:00.000Z | Open filing evidence |
| 2024-07-01 – 2024-09-30 | 7000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
| 2024-01-01 – 2024-09-30 | 14000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
Other Customer · Ipl · Gas
Major Customers · Legal Entity · Statement Business Segments
Source dimensions
srt:MajorCustomersAxis=us-gaap:OtherCustomerMember;dei:LegalEntityAxis=lnt:IplMember;us-gaap:StatementBusinessSegmentsAxis=lnt:GasMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-01-01 – 2026-03-31 | 9000000 | USD | 2026-05-01 · 15:07:49.000Z | Open filing evidence |
| 2025-01-01 – 2025-12-31 | 31000000 | USD | 2026-02-20 · 19:58:00.000Z | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 7000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 23000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 7000000 | USD | 2025-08-08 · 15:49:01.000Z | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 16000000 | USD | 2025-08-08 · 15:49:01.000Z | Open filing evidence |
| 2025-01-01 – 2025-03-31 | 10000000 | USD | 2026-05-01 · 15:07:49.000Z | Open filing evidence |
| 2024-01-01 – 2024-12-31 | 27000000 | USD | 2026-02-20 · 19:58:00.000Z | Open filing evidence |
| 2024-07-01 – 2024-09-30 | 6000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
| 2024-01-01 – 2024-09-30 | 19000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
Other Customer · Ipl · Other Utility
Major Customers · Legal Entity · Statement Business Segments
Source dimensions
srt:MajorCustomersAxis=us-gaap:OtherCustomerMember;dei:LegalEntityAxis=lnt:IplMember;us-gaap:StatementBusinessSegmentsAxis=lnt:OtherUtilityMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-01-01 – 2026-03-31 | 2000000 | USD | 2026-05-01 · 15:07:49.000Z | Open filing evidence |
| 2025-01-01 – 2025-12-31 | 10000000 | USD | 2026-02-20 · 19:58:00.000Z | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 3000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 8000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 2000000 | USD | 2025-08-08 · 15:49:01.000Z | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 5000000 | USD | 2025-08-08 · 15:49:01.000Z | Open filing evidence |
| 2025-01-01 – 2025-03-31 | 2000000 | USD | 2026-05-01 · 15:07:49.000Z | Open filing evidence |
| 2024-01-01 – 2024-12-31 | 9000000 | USD | 2026-02-20 · 19:58:00.000Z | Open filing evidence |
| 2024-07-01 – 2024-09-30 | 2000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
| 2024-01-01 – 2024-09-30 | 5000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
Other Customer · Wpl · Electric
Major Customers · Legal Entity · Statement Business Segments
Source dimensions
srt:MajorCustomersAxis=us-gaap:OtherCustomerMember;dei:LegalEntityAxis=lnt:WplMember;us-gaap:StatementBusinessSegmentsAxis=lnt:ElectricMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-01-01 – 2026-03-31 | 48000000 | USD | 2026-05-01 · 15:07:49.000Z | Open filing evidence |
| 2025-01-01 – 2025-12-31 | 152000000 | USD | 2026-02-20 · 19:58:00.000Z | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 54000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 127000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 47000000 | USD | 2025-08-08 · 15:49:01.000Z | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 72000000 | USD | 2025-08-08 · 15:49:01.000Z | Open filing evidence |
| 2025-01-01 – 2025-03-31 | 25000000 | USD | 2026-05-01 · 15:07:49.000Z | Open filing evidence |
| 2024-01-01 – 2024-12-31 | 139000000 | USD | 2026-02-20 · 19:58:00.000Z | Open filing evidence |
| 2024-07-01 – 2024-09-30 | 47000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
| 2024-01-01 – 2024-09-30 | 106000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
Other Customer · Wpl · Gas
Major Customers · Legal Entity · Statement Business Segments
Source dimensions
srt:MajorCustomersAxis=us-gaap:OtherCustomerMember;dei:LegalEntityAxis=lnt:WplMember;us-gaap:StatementBusinessSegmentsAxis=lnt:GasMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-01-01 – 2026-03-31 | 7000000 | USD | 2026-05-01 · 15:07:49.000Z | Open filing evidence |
| 2025-01-01 – 2025-12-31 | 22000000 | USD | 2026-02-20 · 19:58:00.000Z | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 6000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 16000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 5000000 | USD | 2025-08-08 · 15:49:01.000Z | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 10000000 | USD | 2025-08-08 · 15:49:01.000Z | Open filing evidence |
| 2025-01-01 – 2025-03-31 | 6000000 | USD | 2026-05-01 · 15:07:49.000Z | Open filing evidence |
| 2024-01-01 – 2024-12-31 | 19000000 | USD | 2026-02-20 · 19:58:00.000Z | Open filing evidence |
| 2024-07-01 – 2024-09-30 | 5000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
| 2024-01-01 – 2024-09-30 | 14000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
Other Customer · Wpl · Other Utility
Major Customers · Legal Entity · Statement Business Segments
Source dimensions
srt:MajorCustomersAxis=us-gaap:OtherCustomerMember;dei:LegalEntityAxis=lnt:WplMember;us-gaap:StatementBusinessSegmentsAxis=lnt:OtherUtilityMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-01-01 – 2026-03-31 | 0 | USD | 2026-05-01 · 15:07:49.000Z | Open filing evidence |
| 2025-01-01 – 2025-12-31 | 4000000 | USD | 2026-02-20 · 19:58:00.000Z | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 0 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 1000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 0 | USD | 2025-08-08 · 15:49:01.000Z | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 1000000 | USD | 2025-08-08 · 15:49:01.000Z | Open filing evidence |
| 2025-01-01 – 2025-03-31 | 1000000 | USD | 2026-05-01 · 15:07:49.000Z | Open filing evidence |
| 2024-01-01 – 2024-12-31 | 5000000 | USD | 2026-02-20 · 19:58:00.000Z | Open filing evidence |
| 2024-07-01 – 2024-09-30 | 1000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
| 2024-01-01 – 2024-09-30 | 2000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
Other Customer · Electric
Major Customers · Statement Business Segments
Source dimensions
srt:MajorCustomersAxis=us-gaap:OtherCustomerMember;us-gaap:StatementBusinessSegmentsAxis=lnt:ElectricMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-07-01 – 2026-09-30 | 102000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2026-01-01 – 2026-09-30 | 206000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2026-04-01 – 2026-06-30 | 44000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2026-01-01 – 2026-06-30 | 103000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2026-01-01 – 2026-03-31 | 60000000 | USD | 2026-05-01 · 15:07:49.000Z | Open filing evidence |
| 2025-01-01 – 2025-12-31 | 208000000 | USD | 2026-02-20 · 19:58:00.000Z | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 77000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 166000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 56000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 88000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2025-01-01 – 2025-03-31 | 32000000 | USD | 2026-05-01 · 15:07:49.000Z | Open filing evidence |
| 2024-01-01 – 2024-12-31 | 163000000 | USD | 2026-02-20 · 19:58:00.000Z | Open filing evidence |
| 2024-07-01 – 2024-09-30 | 54000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
| 2024-01-01 – 2024-09-30 | 120000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
Other Customer · Electric · Ipl
Major Customers · Statement Business Segments · Legal Entity
Source dimensions
srt:MajorCustomersAxis=us-gaap:OtherCustomerMember;us-gaap:StatementBusinessSegmentsAxis=lnt:ElectricMember;dei:LegalEntityAxis=lnt:IplMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-07-01 – 2026-09-30 | 22000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2026-01-01 – 2026-09-30 | 44000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2026-04-01 – 2026-06-30 | 11000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2026-01-01 – 2026-06-30 | 22000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 23000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 39000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 9000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 16000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
Other Customer · Electric · Wpl
Major Customers · Statement Business Segments · Legal Entity
Source dimensions
srt:MajorCustomersAxis=us-gaap:OtherCustomerMember;us-gaap:StatementBusinessSegmentsAxis=lnt:ElectricMember;dei:LegalEntityAxis=lnt:WplMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-07-01 – 2026-09-30 | 80000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2026-01-01 – 2026-09-30 | 162000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2026-04-01 – 2026-06-30 | 33000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2026-01-01 – 2026-06-30 | 81000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 54000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 127000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 47000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 72000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
Other Customer · Gas
Major Customers · Statement Business Segments
Source dimensions
srt:MajorCustomersAxis=us-gaap:OtherCustomerMember;us-gaap:StatementBusinessSegmentsAxis=lnt:GasMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-07-01 – 2026-09-30 | 16000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2026-01-01 – 2026-09-30 | 41000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2026-04-01 – 2026-06-30 | 10000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2026-01-01 – 2026-06-30 | 27000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2026-01-01 – 2026-03-31 | 16000000 | USD | 2026-05-01 · 15:07:49.000Z | Open filing evidence |
| 2025-01-01 – 2025-12-31 | 53000000 | USD | 2026-02-20 · 19:58:00.000Z | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 13000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 39000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 12000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 26000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2025-01-01 – 2025-03-31 | 16000000 | USD | 2026-05-01 · 15:07:49.000Z | Open filing evidence |
| 2024-01-01 – 2024-12-31 | 46000000 | USD | 2026-02-20 · 19:58:00.000Z | Open filing evidence |
| 2024-07-01 – 2024-09-30 | 11000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
| 2024-01-01 – 2024-09-30 | 33000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
Other Customer · Gas · Ipl
Major Customers · Statement Business Segments · Legal Entity
Source dimensions
srt:MajorCustomersAxis=us-gaap:OtherCustomerMember;us-gaap:StatementBusinessSegmentsAxis=lnt:GasMember;dei:LegalEntityAxis=lnt:IplMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-07-01 – 2026-09-30 | 9000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2026-01-01 – 2026-09-30 | 22000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2026-04-01 – 2026-06-30 | 5000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2026-01-01 – 2026-06-30 | 15000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 7000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 23000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 7000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 16000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
Other Customer · Gas · Wpl
Major Customers · Statement Business Segments · Legal Entity
Source dimensions
srt:MajorCustomersAxis=us-gaap:OtherCustomerMember;us-gaap:StatementBusinessSegmentsAxis=lnt:GasMember;dei:LegalEntityAxis=lnt:WplMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-07-01 – 2026-09-30 | 7000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2026-01-01 – 2026-09-30 | 19000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2026-04-01 – 2026-06-30 | 5000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2026-01-01 – 2026-06-30 | 12000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 6000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 16000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 5000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 10000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
Other Customer · Other Utility
Major Customers · Statement Business Segments
Source dimensions
srt:MajorCustomersAxis=us-gaap:OtherCustomerMember;us-gaap:StatementBusinessSegmentsAxis=lnt:OtherUtilityMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-07-01 – 2026-09-30 | 1000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2026-01-01 – 2026-09-30 | 6000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2026-04-01 – 2026-06-30 | 2000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2026-01-01 – 2026-06-30 | 5000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2026-01-01 – 2026-03-31 | 2000000 | USD | 2026-05-01 · 15:07:49.000Z | Open filing evidence |
| 2025-01-01 – 2025-12-31 | 14000000 | USD | 2026-02-20 · 19:58:00.000Z | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 3000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 9000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 2000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 6000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2025-01-01 – 2025-03-31 | 3000000 | USD | 2026-05-01 · 15:07:49.000Z | Open filing evidence |
| 2024-01-01 – 2024-12-31 | 14000000 | USD | 2026-02-20 · 19:58:00.000Z | Open filing evidence |
| 2024-07-01 – 2024-09-30 | 3000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
| 2024-01-01 – 2024-09-30 | 7000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
Other Customer · Other Utility · Ipl
Major Customers · Statement Business Segments · Legal Entity
Source dimensions
srt:MajorCustomersAxis=us-gaap:OtherCustomerMember;us-gaap:StatementBusinessSegmentsAxis=lnt:OtherUtilityMember;dei:LegalEntityAxis=lnt:IplMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-07-01 – 2026-09-30 | 1000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2026-01-01 – 2026-09-30 | 4000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2026-04-01 – 2026-06-30 | 1000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2026-01-01 – 2026-06-30 | 3000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 3000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 8000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 2000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 5000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
Other Customer · Other Utility · Wpl
Major Customers · Statement Business Segments · Legal Entity
Source dimensions
srt:MajorCustomersAxis=us-gaap:OtherCustomerMember;us-gaap:StatementBusinessSegmentsAxis=lnt:OtherUtilityMember;dei:LegalEntityAxis=lnt:WplMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-07-01 – 2026-09-30 | 0 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2026-01-01 – 2026-09-30 | 2000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2026-04-01 – 2026-06-30 | 1000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2026-01-01 – 2026-06-30 | 2000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 0 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 1000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 0 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 1000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
Other Customer · All Other Segments
Major Customers · Statement Business Segments
Source dimensions
srt:MajorCustomersAxis=us-gaap:OtherCustomerMember;us-gaap:StatementBusinessSegmentsAxis=us-gaap:AllOtherSegmentsMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-07-01 – 2026-09-30 | 26000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2026-01-01 – 2026-09-30 | 75000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2026-04-01 – 2026-06-30 | 26000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2026-01-01 – 2026-06-30 | 49000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2026-01-01 – 2026-03-31 | 23000000 | USD | 2026-05-01 · 15:07:49.000Z | Open filing evidence |
| 2025-01-01 – 2025-12-31 | 89000000 | USD | 2026-02-20 · 19:58:00.000Z | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 23000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 67000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 23000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 44000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2025-01-01 – 2025-03-31 | 22000000 | USD | 2026-05-01 · 15:07:49.000Z | Open filing evidence |
| 2024-01-01 – 2024-12-31 | 90000000 | USD | 2026-02-20 · 19:58:00.000Z | Open filing evidence |
| 2024-07-01 – 2024-09-30 | 21000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
| 2024-01-01 – 2024-09-30 | 68000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
Electric
Statement Business Segments
Source dimensions
us-gaap:StatementBusinessSegmentsAxis=lnt:ElectricMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-07-01 – 2026-09-30 | 1202000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2026-01-01 – 2026-09-30 | 2951000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2026-04-01 – 2026-06-30 | 861000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2026-01-01 – 2026-06-30 | 1748000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2026-01-01 – 2026-03-31 | 888000000 | USD | 2026-05-01 · 15:07:49.000Z | Open filing evidence |
| 2025-01-01 – 2025-12-31 | 3697000000 | USD | 2026-02-20 · 19:58:00.000Z | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 1124000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 2828000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 851000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 1703000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2025-01-01 – 2025-03-31 | 853000000 | USD | 2026-05-01 · 15:07:49.000Z | Open filing evidence |
| 2024-01-01 – 2024-12-31 | 3372000000 | USD | 2026-02-20 · 19:58:00.000Z | Open filing evidence |
| 2024-07-01 – 2024-09-30 | 999000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
| 2024-01-01 – 2024-09-30 | 2579000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
Electric · Ipl
Statement Business Segments · Legal Entity
Source dimensions
us-gaap:StatementBusinessSegmentsAxis=lnt:ElectricMember;dei:LegalEntityAxis=lnt:IplMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-07-01 – 2026-09-30 | 631000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2026-01-01 – 2026-09-30 | 1499000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 608000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 1455000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
Electric · Wpl
Statement Business Segments · Legal Entity
Source dimensions
us-gaap:StatementBusinessSegmentsAxis=lnt:ElectricMember;dei:LegalEntityAxis=lnt:WplMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-07-01 – 2026-09-30 | 571000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2026-01-01 – 2026-09-30 | 1452000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 516000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 1373000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
Gas
Statement Business Segments
Source dimensions
us-gaap:StatementBusinessSegmentsAxis=lnt:GasMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-07-01 – 2026-09-30 | 56000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2026-01-01 – 2026-09-30 | 408000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2026-04-01 – 2026-06-30 | 82000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2026-01-01 – 2026-06-30 | 353000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2026-01-01 – 2026-03-31 | 271000000 | USD | 2026-05-01 · 15:07:49.000Z | Open filing evidence |
| 2025-01-01 – 2025-12-31 | 525000000 | USD | 2026-02-20 · 19:58:00.000Z | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 51000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 366000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 76000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 316000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2025-01-01 – 2025-03-31 | 240000000 | USD | 2026-05-01 · 15:07:49.000Z | Open filing evidence |
| 2024-01-01 – 2024-12-31 | 465000000 | USD | 2026-02-20 · 19:58:00.000Z | Open filing evidence |
| 2024-07-01 – 2024-09-30 | 49000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
| 2024-01-01 – 2024-09-30 | 322000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
Gas · Ipl
Statement Business Segments · Legal Entity
Source dimensions
us-gaap:StatementBusinessSegmentsAxis=lnt:GasMember;dei:LegalEntityAxis=lnt:IplMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-07-01 – 2026-09-30 | 32000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2026-01-01 – 2026-09-30 | 197000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 27000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 185000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
Gas · Wpl
Statement Business Segments · Legal Entity
Source dimensions
us-gaap:StatementBusinessSegmentsAxis=lnt:GasMember;dei:LegalEntityAxis=lnt:WplMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-07-01 – 2026-09-30 | 24000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2026-01-01 – 2026-09-30 | 211000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 24000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 181000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
Ipl
Statement Business Segments
Source dimensions
us-gaap:StatementBusinessSegmentsAxis=lnt:IplMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-07-01 – 2026-09-30 | 664000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2026-01-01 – 2026-09-30 | 1700000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2026-04-01 – 2026-06-30 | 475000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2026-01-01 – 2026-06-30 | 1036000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2026-01-01 – 2026-03-31 | 561000000 | USD | 2026-05-01 · 15:07:49.000Z | Open filing evidence |
| 2025-01-01 – 2025-12-31 | 2208000000 | USD | 2026-02-20 · 19:58:00.000Z | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 647000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 1676000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 469000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 1030000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2025-01-01 – 2025-03-31 | 560000000 | USD | 2026-05-01 · 15:07:49.000Z | Open filing evidence |
| 2024-01-01 – 2024-12-31 | 2046000000 | USD | 2026-02-20 · 19:58:00.000Z | Open filing evidence |
| 2024-07-01 – 2024-09-30 | 561000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
| 2024-01-01 – 2024-09-30 | 1527000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
Other Utility
Statement Business Segments
Source dimensions
us-gaap:StatementBusinessSegmentsAxis=lnt:OtherUtilityMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-07-01 – 2026-09-30 | 1000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2026-01-01 – 2026-09-30 | 6000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2026-04-01 – 2026-06-30 | 2000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2026-01-01 – 2026-06-30 | 5000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2026-01-01 – 2026-03-31 | 2000000 | USD | 2026-05-01 · 15:07:49.000Z | Open filing evidence |
| 2025-01-01 – 2025-12-31 | 51000000 | USD | 2026-02-20 · 19:58:00.000Z | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 12000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 37000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 11000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 25000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2025-01-01 – 2025-03-31 | 13000000 | USD | 2026-05-01 · 15:07:49.000Z | Open filing evidence |
| 2024-01-01 – 2024-12-31 | 54000000 | USD | 2026-02-20 · 19:58:00.000Z | Open filing evidence |
| 2024-07-01 – 2024-09-30 | 12000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
| 2024-01-01 – 2024-09-30 | 36000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
Other Utility · Ipl
Statement Business Segments · Legal Entity
Source dimensions
us-gaap:StatementBusinessSegmentsAxis=lnt:OtherUtilityMember;dei:LegalEntityAxis=lnt:IplMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-07-01 – 2026-09-30 | 1000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2026-01-01 – 2026-09-30 | 4000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 12000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 36000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
Other Utility · Wpl
Statement Business Segments · Legal Entity
Source dimensions
us-gaap:StatementBusinessSegmentsAxis=lnt:OtherUtilityMember;dei:LegalEntityAxis=lnt:WplMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-07-01 – 2026-09-30 | 0 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2026-01-01 – 2026-09-30 | 2000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 0 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 1000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
Wpl
Statement Business Segments
Source dimensions
us-gaap:StatementBusinessSegmentsAxis=lnt:WplMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-07-01 – 2026-09-30 | 595000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2026-01-01 – 2026-09-30 | 1665000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2026-04-01 – 2026-06-30 | 470000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2026-01-01 – 2026-06-30 | 1070000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2026-01-01 – 2026-03-31 | 600000000 | USD | 2026-05-01 · 15:07:49.000Z | Open filing evidence |
| 2025-01-01 – 2025-12-31 | 2065000000 | USD | 2026-02-20 · 19:58:00.000Z | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 540000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 1555000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 469000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 1014000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2025-01-01 – 2025-03-31 | 546000000 | USD | 2026-05-01 · 15:07:49.000Z | Open filing evidence |
| 2024-01-01 – 2024-12-31 | 1845000000 | USD | 2026-02-20 · 19:58:00.000Z | Open filing evidence |
| 2024-07-01 – 2024-09-30 | 499000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
| 2024-01-01 – 2024-09-30 | 1410000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
All Other Segments
Statement Business Segments
Source dimensions
us-gaap:StatementBusinessSegmentsAxis=us-gaap:AllOtherSegmentsMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-07-01 – 2026-09-30 | 26000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2026-01-01 – 2026-09-30 | 75000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2026-04-01 – 2026-06-30 | 26000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2026-01-01 – 2026-06-30 | 49000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2026-01-01 – 2026-03-31 | 23000000 | USD | 2026-05-01 · 15:07:49.000Z | Open filing evidence |
| 2025-01-01 – 2025-12-31 | 89000000 | USD | 2026-02-20 · 19:58:00.000Z | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 23000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 67000000 | USD | 2026-10-30 · 15:21:58.000Z | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 23000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 44000000 | USD | 2026-07-31 · 15:22:47.000Z | Open filing evidence |
| 2025-01-01 – 2025-03-31 | 22000000 | USD | 2026-05-01 · 15:07:49.000Z | Open filing evidence |
| 2024-01-01 – 2024-12-31 | 90000000 | USD | 2026-02-20 · 19:58:00.000Z | Open filing evidence |
| 2024-07-01 – 2024-09-30 | 21000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |
| 2024-01-01 – 2024-09-30 | 68000000 | USD | 2025-11-07 · 17:02:34.000Z | Open filing evidence |