Fundies. English
Segment disclosures
Company overviewBERKLEY W R CORP
Each reported dimension combination stays separate. Revenue and operating income are shown as reported, with their dates and sources.
Revenue · Reported segment facts
41 dimension combinations 614 retained observations 66 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.
Operating Segments · Non Us · Insurance Domestic Segment
Consolidation Items · Statement Geographical · Statement Business Segments
Source dimensions
srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;srt:StatementGeographicalAxis=us-gaap:NonUsMember;us-gaap:StatementBusinessSegmentsAxis=wrb:InsuranceDomesticSegmentMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2025-01-01 – 2025-12-31 | 1408000000 | USD | 2026-02-27 · 21:17:52.000Z | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 357000000 | USD | 2025-11-03 · 21:10:47.000Z | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 1051000000 | USD | 2025-11-03 · 21:10:47.000Z | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 361000000 | USD | 2025-08-04 · 20:13:18.000Z | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 694000000 | USD | 2025-08-04 · 20:13:18.000Z | Open filing evidence |
| 2024-01-01 – 2024-12-31 | 1471000000 | USD | 2026-02-27 · 21:17:52.000Z | Open filing evidence |
| 2024-07-01 – 2024-09-30 | 350000000 | USD | 2025-11-03 · 21:10:47.000Z | Open filing evidence |
| 2024-01-01 – 2024-09-30 | 1112000000 | USD | 2025-11-03 · 21:10:47.000Z | Open filing evidence |
| 2024-04-01 – 2024-06-30 | 368000000 | USD | 2025-08-04 · 20:13:18.000Z | Open filing evidence |
| 2024-01-01 – 2024-06-30 | 762000000 | USD | 2025-08-04 · 20:13:18.000Z | Open filing evidence |
| 2023-01-01 – 2023-12-31 | 1171000000 | USD | 2026-02-27 · 21:17:52.000Z | Open filing evidence |
| 2019-01-01 – 2019-12-31 | 725400000 | USD | 2020-02-20 · 21:20:08.000Z | Open filing evidence |
| 2018-01-01 – 2018-12-31 | 714200000 | USD | 2020-02-20 · 21:20:08.000Z | Open filing evidence |
| 2017-01-01 – 2017-12-31 | 688200000 | USD | 2020-02-20 · 21:20:08.000Z | Open filing evidence |
Operating Segments · Non Us · Insurance Segment
Consolidation Items · Statement Geographical · Statement Business Segments
Source dimensions
srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;srt:StatementGeographicalAxis=us-gaap:NonUsMember;us-gaap:StatementBusinessSegmentsAxis=wrb:InsuranceSegmentMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-01-01 – 2026-03-31 | 376000000 | USD | 2026-05-01 · 20:15:33.000Z | Open filing evidence |
| 2025-01-01 – 2025-03-31 | 333000000 | USD | 2026-05-01 · 20:15:33.000Z | Open filing evidence |
Operating Segments · Non Us · Reinsuranceand Monoline Excess Segment
Consolidation Items · Statement Geographical · Statement Business Segments
Source dimensions
srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;srt:StatementGeographicalAxis=us-gaap:NonUsMember;us-gaap:StatementBusinessSegmentsAxis=wrb:ReinsuranceandMonolineExcessSegmentMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-01-01 – 2026-03-31 | 113000000 | USD | 2026-05-01 · 20:15:33.000Z | Open filing evidence |
| 2025-01-01 – 2025-12-31 | 516000000 | USD | 2026-02-27 · 21:17:52.000Z | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 136000000 | USD | 2025-11-03 · 21:10:47.000Z | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 382000000 | USD | 2025-11-03 · 21:10:47.000Z | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 116000000 | USD | 2025-08-04 · 20:13:18.000Z | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 246000000 | USD | 2025-08-04 · 20:13:18.000Z | Open filing evidence |
| 2025-01-01 – 2025-03-31 | 130000000 | USD | 2026-05-01 · 20:15:33.000Z | Open filing evidence |
| 2024-01-01 – 2024-12-31 | 485000000 | USD | 2026-02-27 · 21:17:52.000Z | Open filing evidence |
| 2024-07-01 – 2024-09-30 | 125000000 | USD | 2025-11-03 · 21:10:47.000Z | Open filing evidence |
| 2024-01-01 – 2024-09-30 | 353000000 | USD | 2025-11-03 · 21:10:47.000Z | Open filing evidence |
| 2024-04-01 – 2024-06-30 | 117000000 | USD | 2025-08-04 · 20:13:18.000Z | Open filing evidence |
| 2024-01-01 – 2024-06-30 | 228000000 | USD | 2025-08-04 · 20:13:18.000Z | Open filing evidence |
| 2023-01-01 – 2023-12-31 | 463000000 | USD | 2026-02-27 · 21:17:52.000Z | Open filing evidence |
| 2022-01-01 – 2022-12-31 | 412000000 | USD | 2023-02-24 · 13:37:12.000Z | Open filing evidence |
| 2021-01-01 – 2021-12-31 | 380000000 | USD | 2023-02-24 · 13:37:12.000Z | Open filing evidence |
| 2020-01-01 – 2020-12-31 | 292000000 | USD | 2023-02-24 · 13:37:12.000Z | Open filing evidence |
| 2019-01-01 – 2019-12-31 | 249600000 | USD | 2020-02-20 · 21:20:08.000Z | Open filing evidence |
| 2018-01-01 – 2018-12-31 | 228100000 | USD | 2020-02-20 · 21:20:08.000Z | Open filing evidence |
| 2017-01-01 – 2017-12-31 | 201300000 | USD | 2020-02-20 · 21:20:08.000Z | Open filing evidence |
Operating Segments · Insurance Domestic Segment
Consolidation Items · Statement Business Segments
Source dimensions
srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;us-gaap:StatementBusinessSegmentsAxis=wrb:InsuranceDomesticSegmentMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2025-01-01 – 2025-12-31 | 12095601000 | USD | 2026-02-27 · 21:17:52.000Z | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 3043593000 | USD | 2025-11-03 · 21:10:47.000Z | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 9025715000 | USD | 2025-11-03 · 21:10:47.000Z | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 3038414000 | USD | 2025-08-04 · 20:13:18.000Z | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 5982121000 | USD | 2025-08-04 · 20:13:18.000Z | Open filing evidence |
| 2025-01-01 – 2025-03-31 | 2943707000 | USD | 2025-05-02 · 20:11:59.000Z | Open filing evidence |
| 2024-01-01 – 2024-12-31 | 11181501000 | USD | 2026-02-27 · 21:17:52.000Z | Open filing evidence |
| 2024-07-01 – 2024-09-30 | 2826913000 | USD | 2025-11-03 · 21:10:47.000Z | Open filing evidence |
| 2024-01-01 – 2024-09-30 | 8277603000 | USD | 2025-11-03 · 21:10:47.000Z | Open filing evidence |
| 2024-04-01 – 2024-06-30 | 2797721000 | USD | 2025-08-04 · 20:13:18.000Z | Open filing evidence |
| 2024-01-01 – 2024-06-30 | 5450690000 | USD | 2025-08-04 · 20:13:18.000Z | Open filing evidence |
| 2024-01-01 – 2024-03-31 | 2652969000 | USD | 2025-05-02 · 20:11:59.000Z | Open filing evidence |
| 2023-01-01 – 2023-12-31 | 9827866000 | USD | 2026-02-27 · 21:17:52.000Z | Open filing evidence |
| 2023-07-01 – 2023-09-30 | 2505090000 | USD | 2024-11-04 · 21:10:52.000Z | Open filing evidence |
| 2023-01-01 – 2023-09-30 | 7230514000 | USD | 2024-11-04 · 21:10:52.000Z | Open filing evidence |
| 2023-04-01 – 2023-06-30 | 2442551000 | USD | 2023-08-03 · 20:07:38.000Z | Open filing evidence |
| 2023-01-01 – 2023-06-30 | 4800086000 | USD | 2023-08-03 · 20:07:38.000Z | Open filing evidence |
| 2023-01-01 – 2023-03-31 | 2316059000 | USD | 2024-05-03 · 20:11:43.000Z | Open filing evidence |
| 2022-01-01 – 2022-12-31 | 8749019000 | USD | 2025-02-24 · 21:18:40.000Z | Open filing evidence |
| 2022-04-01 – 2022-06-30 | 2192616000 | USD | 2023-08-03 · 20:07:38.000Z | Open filing evidence |
| 2022-01-01 – 2022-06-30 | 4301781000 | USD | 2023-08-03 · 20:07:38.000Z | Open filing evidence |
| 2021-07-01 – 2021-09-30 | 1945130000 | USD | 2021-11-04 · 20:20:42.000Z | Open filing evidence |
| 2021-01-01 – 2021-09-30 | 5515743000 | USD | 2021-11-04 · 20:20:42.000Z | Open filing evidence |
| 2020-01-01 – 2020-12-31 | 6478834000 | USD | 2021-02-18 · 22:21:32.000Z | Open filing evidence |
| 2020-07-01 – 2020-09-30 | 1628384000 | USD | 2021-11-04 · 20:20:42.000Z | Open filing evidence |
| 2020-01-01 – 2020-09-30 | 4762437000 | USD | 2021-11-04 · 20:20:42.000Z | Open filing evidence |
| 2020-01-01 – 2020-03-31 | 1616886000 | USD | 2020-05-04 · 20:13:30.000Z | Open filing evidence |
| 2019-01-01 – 2019-12-31 | 6397074000 | USD | 2021-02-18 · 22:21:32.000Z | Open filing evidence |
| 2019-07-01 – 2019-09-30 | 1605093000 | USD | 2019-11-07 · 21:32:56.000Z | Open filing evidence |
| 2019-01-01 – 2019-09-30 | 4766685000 | USD | 2019-11-07 · 21:32:56.000Z | Open filing evidence |
| 2019-04-01 – 2019-06-30 | 1621274000 | USD | 2019-08-05 · 20:11:10.000Z | Open filing evidence |
| 2019-01-01 – 2019-06-30 | 3161593000 | USD | 2019-08-05 · 20:11:10.000Z | Open filing evidence |
| 2019-01-01 – 2019-03-31 | 1540319000 | USD | 2020-05-04 · 20:13:30.000Z | Open filing evidence |
| 2018-01-01 – 2018-12-31 | 6208290000 | USD | 2021-02-18 · 22:21:32.000Z | Open filing evidence |
| 2018-07-01 – 2018-09-30 | 1591849000 | USD | 2019-11-07 · 21:32:56.000Z | Open filing evidence |
| 2018-01-01 – 2018-09-30 | 4644434000 | USD | 2019-11-07 · 21:32:56.000Z | Open filing evidence |
| 2018-04-01 – 2018-06-30 | 1528828000 | USD | 2019-08-05 · 20:11:10.000Z | Open filing evidence |
| 2018-01-01 – 2018-06-30 | 3052583000 | USD | 2019-08-05 · 20:11:10.000Z | Open filing evidence |
| 2018-01-01 – 2018-03-31 | 1523754000 | USD | 2019-05-08 · 20:14:38.000Z | Open filing evidence |
| 2017-01-01 – 2017-12-31 | 6003130000 | USD | 2020-02-20 · 21:20:08.000Z | Open filing evidence |
Operating Segments · Insurance Domestic Segment · Non Us
Consolidation Items · Statement Business Segments · Statement Geographical
Source dimensions
srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;us-gaap:StatementBusinessSegmentsAxis=wrb:InsuranceDomesticSegmentMember;srt:StatementGeographicalAxis=us-gaap:NonUsMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2023-04-01 – 2023-06-30 | 280000000 | USD | 2023-08-03 · 20:07:38.000Z | Open filing evidence |
| 2023-01-01 – 2023-06-30 | 554000000 | USD | 2023-08-03 · 20:07:38.000Z | Open filing evidence |
| 2022-04-01 – 2022-06-30 | 263000000 | USD | 2023-08-03 · 20:07:38.000Z | Open filing evidence |
| 2022-01-01 – 2022-06-30 | 498000000 | USD | 2023-08-03 · 20:07:38.000Z | Open filing evidence |
Operating Segments · Insurance International Segment
Consolidation Items · Statement Business Segments
Source dimensions
srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;us-gaap:StatementBusinessSegmentsAxis=wrb:InsuranceInternationalSegmentMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2022-07-01 – 2022-09-30 | 252000000 | USD | 2022-11-04 · 20:15:44.000Z | Open filing evidence |
| 2022-01-01 – 2022-09-30 | 750000000 | USD | 2022-11-04 · 20:15:44.000Z | Open filing evidence |
| 2021-07-01 – 2021-09-30 | 220000000 | USD | 2022-11-04 · 20:15:44.000Z | Open filing evidence |
| 2021-01-01 – 2021-09-30 | 638000000 | USD | 2022-11-04 · 20:15:44.000Z | Open filing evidence |
| 2021-01-01 – 2021-03-31 | 196000000 | USD | 2021-05-05 · 20:16:48.000Z | Open filing evidence |
| 2020-07-01 – 2020-09-30 | 183000000 | USD | 2021-11-04 · 20:20:42.000Z | Open filing evidence |
| 2020-01-01 – 2020-09-30 | 500000000 | USD | 2021-11-04 · 20:20:42.000Z | Open filing evidence |
| 2020-01-01 – 2020-03-31 | 168000000 | USD | 2021-05-05 · 20:16:48.000Z | Open filing evidence |
| 2019-07-01 – 2019-09-30 | 185000000 | USD | 2020-11-05 · 21:21:25.000Z | Open filing evidence |
| 2019-01-01 – 2019-09-30 | 535000000 | USD | 2020-11-05 · 21:21:25.000Z | Open filing evidence |
| 2019-04-01 – 2019-06-30 | 179000000 | USD | 2019-08-05 · 20:11:10.000Z | Open filing evidence |
| 2019-01-01 – 2019-06-30 | 349000000 | USD | 2019-08-05 · 20:11:10.000Z | Open filing evidence |
| 2019-01-01 – 2019-03-31 | 170000000 | USD | 2020-05-04 · 20:13:30.000Z | Open filing evidence |
| 2018-07-01 – 2018-09-30 | 176000000 | USD | 2019-11-07 · 21:32:56.000Z | Open filing evidence |
| 2018-01-01 – 2018-09-30 | 535000000 | USD | 2019-11-07 · 21:32:56.000Z | Open filing evidence |
| 2018-04-01 – 2018-06-30 | 176000000 | USD | 2019-08-05 · 20:11:10.000Z | Open filing evidence |
| 2018-01-01 – 2018-06-30 | 359000000 | USD | 2019-08-05 · 20:11:10.000Z | Open filing evidence |
| 2018-01-01 – 2018-03-31 | 183000000 | USD | 2019-05-08 · 20:14:38.000Z | Open filing evidence |
Operating Segments · Insurance Segment
Consolidation Items · Statement Business Segments
Source dimensions
srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;us-gaap:StatementBusinessSegmentsAxis=wrb:InsuranceSegmentMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-04-01 – 2026-06-30 | 3173718000 | USD | 2026-07-31 · 20:15:25.000Z | Open filing evidence |
| 2026-01-01 – 2026-06-30 | 6260293000 | USD | 2026-07-31 · 20:15:25.000Z | Open filing evidence |
| 2026-01-01 – 2026-03-31 | 3086576000 | USD | 2026-05-01 · 20:15:33.000Z | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 3038414000 | USD | 2026-07-31 · 20:15:25.000Z | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 5982121000 | USD | 2026-07-31 · 20:15:25.000Z | Open filing evidence |
| 2025-01-01 – 2025-03-31 | 2943707000 | USD | 2026-05-01 · 20:15:33.000Z | Open filing evidence |
Operating Segments · Reinsuranceand Monoline Excess Segment
Consolidation Items · Statement Business Segments
Source dimensions
srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;us-gaap:StatementBusinessSegmentsAxis=wrb:ReinsuranceandMonolineExcessSegmentMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-04-01 – 2026-06-30 | 432116000 | USD | 2026-07-31 · 20:15:25.000Z | Open filing evidence |
| 2026-01-01 – 2026-06-30 | 849645000 | USD | 2026-07-31 · 20:15:25.000Z | Open filing evidence |
| 2026-01-01 – 2026-03-31 | 417529000 | USD | 2026-05-01 · 20:15:33.000Z | Open filing evidence |
| 2025-01-01 – 2025-12-31 | 1781761000 | USD | 2026-02-27 · 21:17:52.000Z | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 454995000 | USD | 2025-11-03 · 21:10:47.000Z | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 1341558000 | USD | 2025-11-03 · 21:10:47.000Z | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 450259000 | USD | 2026-07-31 · 20:15:25.000Z | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 886563000 | USD | 2026-07-31 · 20:15:25.000Z | Open filing evidence |
| 2025-01-01 – 2025-03-31 | 436304000 | USD | 2026-05-01 · 20:15:33.000Z | Open filing evidence |
| 2024-01-01 – 2024-12-31 | 1696905000 | USD | 2026-02-27 · 21:17:52.000Z | Open filing evidence |
| 2024-07-01 – 2024-09-30 | 419370000 | USD | 2025-11-03 · 21:10:47.000Z | Open filing evidence |
| 2024-01-01 – 2024-09-30 | 1258478000 | USD | 2025-11-03 · 21:10:47.000Z | Open filing evidence |
| 2024-04-01 – 2024-06-30 | 420318000 | USD | 2025-08-04 · 20:13:18.000Z | Open filing evidence |
| 2024-01-01 – 2024-06-30 | 839107000 | USD | 2025-08-04 · 20:13:18.000Z | Open filing evidence |
| 2024-01-01 – 2024-03-31 | 418790000 | USD | 2025-05-02 · 20:11:59.000Z | Open filing evidence |
| 2023-01-01 – 2023-12-31 | 1615277000 | USD | 2026-02-27 · 21:17:52.000Z | Open filing evidence |
| 2023-07-01 – 2023-09-30 | 409018000 Restated | USD | 2024-11-04 · 21:10:52.000Z | Open filing evidence |
| 2023-01-01 – 2023-09-30 | 1191836000 Restated | USD | 2024-11-04 · 21:10:52.000Z | Open filing evidence |
| 2023-04-01 – 2023-06-30 | 346543000 | USD | 2023-08-03 · 20:07:38.000Z | Open filing evidence |
| 2023-01-01 – 2023-06-30 | 708156000 | USD | 2023-08-03 · 20:07:38.000Z | Open filing evidence |
| 2022-01-01 – 2022-12-31 | 1590113000 Restated | USD | 2025-02-24 · 21:18:40.000Z | Open filing evidence |
| 2022-07-01 – 2022-09-30 | 368181000 | USD | 2023-11-03 · 20:11:31.000Z | Open filing evidence |
| 2022-01-01 – 2022-09-30 | 1025968000 | USD | 2023-11-03 · 20:11:31.000Z | Open filing evidence |
| 2022-04-01 – 2022-06-30 | 344112000 | USD | 2023-08-03 · 20:07:38.000Z | Open filing evidence |
| 2022-01-01 – 2022-06-30 | 657787000 | USD | 2023-08-03 · 20:07:38.000Z | Open filing evidence |
| 2021-01-01 – 2021-12-31 | 1203647000 | USD | 2023-02-24 · 13:37:12.000Z | Open filing evidence |
| 2021-07-01 – 2021-09-30 | 310451000 | USD | 2022-11-04 · 20:15:44.000Z | Open filing evidence |
| 2021-01-01 – 2021-09-30 | 884437000 | USD | 2022-11-04 · 20:15:44.000Z | Open filing evidence |
| 2021-01-01 – 2021-03-31 | 282685000 | USD | 2021-05-05 · 20:16:48.000Z | Open filing evidence |
| 2020-01-01 – 2020-12-31 | 1009203000 | USD | 2023-02-24 · 13:37:12.000Z | Open filing evidence |
| 2020-04-01 – 2020-06-30 | 235332000 | USD | 2020-08-03 · 20:16:12.000Z | Open filing evidence |
| 2020-01-01 – 2020-06-30 | 479505000 | USD | 2020-08-03 · 20:16:12.000Z | Open filing evidence |
| 2020-01-01 – 2020-03-31 | 244173000 | USD | 2021-05-05 · 20:16:48.000Z | Open filing evidence |
| 2019-01-01 – 2019-12-31 | 877551000 | USD | 2022-02-24 · 21:51:04.000Z | Open filing evidence |
| 2019-04-01 – 2019-06-30 | 216106000 | USD | 2020-08-03 · 20:16:12.000Z | Open filing evidence |
| 2019-01-01 – 2019-06-30 | 421502000 | USD | 2020-08-03 · 20:16:12.000Z | Open filing evidence |
| 2019-01-01 – 2019-03-31 | 205396000 | USD | 2020-05-04 · 20:13:30.000Z | Open filing evidence |
| 2018-01-01 – 2018-12-31 | 848966000 | USD | 2020-02-20 · 21:20:08.000Z | Open filing evidence |
| 2017-01-01 – 2017-12-31 | 922478000 | USD | 2020-02-20 · 21:20:08.000Z | Open filing evidence |
Operating Segments · Reinsuranceand Monoline Excess Segment · Non Us
Consolidation Items · Statement Business Segments · Statement Geographical
Source dimensions
srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;us-gaap:StatementBusinessSegmentsAxis=wrb:ReinsuranceandMonolineExcessSegmentMember;srt:StatementGeographicalAxis=us-gaap:NonUsMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2023-04-01 – 2023-06-30 | 102000000 | USD | 2023-08-03 · 20:07:38.000Z | Open filing evidence |
| 2023-01-01 – 2023-06-30 | 209000000 | USD | 2023-08-03 · 20:07:38.000Z | Open filing evidence |
| 2022-04-01 – 2022-06-30 | 93000000 | USD | 2023-08-03 · 20:07:38.000Z | Open filing evidence |
| 2022-01-01 – 2022-06-30 | 189000000 | USD | 2023-08-03 · 20:07:38.000Z | Open filing evidence |
Operating Segments · Reinsurance Global Segment
Consolidation Items · Statement Business Segments
Source dimensions
srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;us-gaap:StatementBusinessSegmentsAxis=wrb:ReinsuranceGlobalSegmentMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2019-07-01 – 2019-09-30 | 226724000 | USD | 2019-11-07 · 21:32:56.000Z | Open filing evidence |
| 2019-01-01 – 2019-09-30 | 648227000 | USD | 2019-11-07 · 21:32:56.000Z | Open filing evidence |
| 2019-04-01 – 2019-06-30 | 216106000 | USD | 2019-08-05 · 20:11:10.000Z | Open filing evidence |
| 2019-01-01 – 2019-06-30 | 421502000 | USD | 2019-08-05 · 20:11:10.000Z | Open filing evidence |
| 2019-01-01 – 2019-03-31 | 205396000 | USD | 2019-05-08 · 20:14:38.000Z | Open filing evidence |
| 2018-07-01 – 2018-09-30 | 201228000 | USD | 2019-11-07 · 21:32:56.000Z | Open filing evidence |
| 2018-01-01 – 2018-09-30 | 631749000 | USD | 2019-11-07 · 21:32:56.000Z | Open filing evidence |
| 2018-04-01 – 2018-06-30 | 207388000 | USD | 2019-08-05 · 20:11:10.000Z | Open filing evidence |
| 2018-01-01 – 2018-06-30 | 430521000 | USD | 2019-08-05 · 20:11:10.000Z | Open filing evidence |
| 2018-01-01 – 2018-03-31 | 223134000 | USD | 2019-05-08 · 20:14:38.000Z | Open filing evidence |
Operating Segments · Reinsurance International
Consolidation Items · Statement Business Segments
Source dimensions
srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;us-gaap:StatementBusinessSegmentsAxis=wrb:ReinsuranceInternationalMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2022-07-01 – 2022-09-30 | 117000000 | USD | 2022-11-04 · 20:15:44.000Z | Open filing evidence |
| 2022-01-01 – 2022-09-30 | 307000000 | USD | 2022-11-04 · 20:15:44.000Z | Open filing evidence |
| 2022-04-01 – 2022-06-30 | 93000000 | USD | 2022-08-02 · 20:21:31.000Z | Open filing evidence |
| 2022-01-01 – 2022-06-30 | 189000000 | USD | 2022-08-02 · 20:21:31.000Z | Open filing evidence |
| 2021-07-01 – 2021-09-30 | 100000000 | USD | 2022-11-04 · 20:15:44.000Z | Open filing evidence |
| 2021-01-01 – 2021-09-30 | 278000000 | USD | 2022-11-04 · 20:15:44.000Z | Open filing evidence |
| 2021-04-01 – 2021-06-30 | 90000000 | USD | 2022-08-02 · 20:21:31.000Z | Open filing evidence |
| 2021-01-01 – 2021-06-30 | 178000000 | USD | 2022-08-02 · 20:21:31.000Z | Open filing evidence |
| 2021-01-01 – 2021-03-31 | 88000000 | USD | 2021-05-05 · 20:16:48.000Z | Open filing evidence |
| 2020-07-01 – 2020-09-30 | 77000000 | USD | 2021-11-04 · 20:20:42.000Z | Open filing evidence |
| 2020-01-01 – 2020-09-30 | 212000000 | USD | 2021-11-04 · 20:20:42.000Z | Open filing evidence |
| 2020-04-01 – 2020-06-30 | 65000000 | USD | 2021-08-02 · 20:10:18.000Z | Open filing evidence |
| 2020-01-01 – 2020-06-30 | 134000000 | USD | 2021-08-02 · 20:10:18.000Z | Open filing evidence |
| 2020-01-01 – 2020-03-31 | 69000000 | USD | 2021-05-05 · 20:16:48.000Z | Open filing evidence |
| 2019-07-01 – 2019-09-30 | 65000000 | USD | 2019-11-07 · 21:32:56.000Z | Open filing evidence |
| 2019-01-01 – 2019-09-30 | 186000000 | USD | 2019-11-07 · 21:32:56.000Z | Open filing evidence |
| 2019-04-01 – 2019-06-30 | 62000000 | USD | 2020-08-03 · 20:16:12.000Z | Open filing evidence |
| 2019-01-01 – 2019-06-30 | 121000000 | USD | 2020-08-03 · 20:16:12.000Z | Open filing evidence |
| 2019-01-01 – 2019-03-31 | 59000000 | USD | 2020-05-04 · 20:13:30.000Z | Open filing evidence |
| 2018-07-01 – 2018-09-30 | 51000000 | USD | 2019-11-07 · 21:32:56.000Z | Open filing evidence |
| 2018-01-01 – 2018-09-30 | 163000000 | USD | 2019-11-07 · 21:32:56.000Z | Open filing evidence |
| 2018-04-01 – 2018-06-30 | 55000000 | USD | 2019-08-05 · 20:11:10.000Z | Open filing evidence |
| 2018-01-01 – 2018-06-30 | 112000000 | USD | 2019-08-05 · 20:11:10.000Z | Open filing evidence |
| 2018-01-01 – 2018-03-31 | 56000000 | USD | 2019-05-08 · 20:14:38.000Z | Open filing evidence |
Non Us · Operating Segments · Insurance Domestic Segment
Statement Geographical · Consolidation Items · Statement Business Segments
Source dimensions
srt:StatementGeographicalAxis=us-gaap:NonUsMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;us-gaap:StatementBusinessSegmentsAxis=wrb:InsuranceDomesticSegmentMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2025-01-01 – 2025-03-31 | 333000000 | USD | 2025-05-02 · 20:11:59.000Z | Open filing evidence |
| 2024-01-01 – 2024-12-31 | 1471000000 | USD | 2025-02-24 · 21:18:40.000Z | Open filing evidence |
| 2024-07-01 – 2024-09-30 | 350000000 | USD | 2024-11-04 · 21:10:52.000Z | Open filing evidence |
| 2024-01-01 – 2024-09-30 | 1112000000 | USD | 2024-11-04 · 21:10:52.000Z | Open filing evidence |
| 2024-01-01 – 2024-03-31 | 393000000 | USD | 2025-05-02 · 20:11:59.000Z | Open filing evidence |
| 2023-01-01 – 2023-12-31 | 1171000000 | USD | 2025-02-24 · 21:18:40.000Z | Open filing evidence |
| 2023-07-01 – 2023-09-30 | 298000000 | USD | 2024-11-04 · 21:10:52.000Z | Open filing evidence |
| 2023-01-01 – 2023-09-30 | 852000000 | USD | 2024-11-04 · 21:10:52.000Z | Open filing evidence |
| 2023-01-01 – 2023-03-31 | 274000000 | USD | 2024-05-03 · 20:11:43.000Z | Open filing evidence |
| 2022-01-01 – 2022-12-31 | 1029000000 | USD | 2025-02-24 · 21:18:40.000Z | Open filing evidence |
Non Us · Operating Segments · Reinsuranceand Monoline Excess Segment
Statement Geographical · Consolidation Items · Statement Business Segments
Source dimensions
srt:StatementGeographicalAxis=us-gaap:NonUsMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;us-gaap:StatementBusinessSegmentsAxis=wrb:ReinsuranceandMonolineExcessSegmentMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2025-01-01 – 2025-03-31 | 130000000 | USD | 2025-05-02 · 20:11:59.000Z | Open filing evidence |
| 2024-01-01 – 2024-12-31 | 485000000 | USD | 2025-02-24 · 21:18:40.000Z | Open filing evidence |
| 2024-07-01 – 2024-09-30 | 125000000 | USD | 2024-11-04 · 21:10:52.000Z | Open filing evidence |
| 2024-01-01 – 2024-09-30 | 353000000 | USD | 2024-11-04 · 21:10:52.000Z | Open filing evidence |
| 2024-01-01 – 2024-03-31 | 111000000 | USD | 2025-05-02 · 20:11:59.000Z | Open filing evidence |
| 2023-01-01 – 2023-12-31 | 463000000 | USD | 2025-02-24 · 21:18:40.000Z | Open filing evidence |
| 2023-07-01 – 2023-09-30 | 124000000 | USD | 2024-11-04 · 21:10:52.000Z | Open filing evidence |
| 2023-01-01 – 2023-09-30 | 333000000 | USD | 2024-11-04 · 21:10:52.000Z | Open filing evidence |
| 2022-01-01 – 2022-12-31 | 412000000 | USD | 2025-02-24 · 21:18:40.000Z | Open filing evidence |
| 2022-07-01 – 2022-09-30 | 117000000 | USD | 2023-11-03 · 20:11:31.000Z | Open filing evidence |
| 2022-01-01 – 2022-09-30 | 307000000 | USD | 2023-11-03 · 20:11:31.000Z | Open filing evidence |
| 2021-01-01 – 2021-12-31 | 380000000 | USD | 2022-02-24 · 21:51:04.000Z | Open filing evidence |
| 2020-01-01 – 2020-12-31 | 292000000 | USD | 2022-02-24 · 21:51:04.000Z | Open filing evidence |
| 2019-01-01 – 2019-12-31 | 250000000 | USD | 2022-02-24 · 21:51:04.000Z | Open filing evidence |
Non Us · Insurance Domestic Segment · Operating Segments
Statement Geographical · Statement Business Segments · Consolidation Items
Source dimensions
srt:StatementGeographicalAxis=us-gaap:NonUsMember;us-gaap:StatementBusinessSegmentsAxis=wrb:InsuranceDomesticSegmentMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2023-07-01 – 2023-09-30 | 298000000 | USD | 2023-11-03 · 20:11:31.000Z | Open filing evidence |
| 2023-01-01 – 2023-09-30 | 852000000 | USD | 2023-11-03 · 20:11:31.000Z | Open filing evidence |
| 2022-07-01 – 2022-09-30 | 252000000 | USD | 2023-11-03 · 20:11:31.000Z | Open filing evidence |
| 2022-01-01 – 2022-09-30 | 750000000 | USD | 2023-11-03 · 20:11:31.000Z | Open filing evidence |
| 2020-01-01 – 2020-12-31 | 691500000 | USD | 2021-02-18 · 22:21:32.000Z | Open filing evidence |
| 2019-01-01 – 2019-12-31 | 725400000 | USD | 2021-02-18 · 22:21:32.000Z | Open filing evidence |
| 2018-01-01 – 2018-12-31 | 714200000 | USD | 2021-02-18 · 22:21:32.000Z | Open filing evidence |
Non Us · Insurance Segment · Operating Segments
Statement Geographical · Statement Business Segments · Consolidation Items
Source dimensions
srt:StatementGeographicalAxis=us-gaap:NonUsMember;us-gaap:StatementBusinessSegmentsAxis=wrb:InsuranceSegmentMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-04-01 – 2026-06-30 | 386000000 | USD | 2026-07-31 · 20:15:25.000Z | Open filing evidence |
| 2026-01-01 – 2026-06-30 | 763000000 | USD | 2026-07-31 · 20:15:25.000Z | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 361000000 | USD | 2026-07-31 · 20:15:25.000Z | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 694000000 | USD | 2026-07-31 · 20:15:25.000Z | Open filing evidence |
Non Us · Reinsuranceand Monoline Excess Segment · Operating Segments
Statement Geographical · Statement Business Segments · Consolidation Items
Source dimensions
srt:StatementGeographicalAxis=us-gaap:NonUsMember;us-gaap:StatementBusinessSegmentsAxis=wrb:ReinsuranceandMonolineExcessSegmentMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-04-01 – 2026-06-30 | 118000000 | USD | 2026-07-31 · 20:15:25.000Z | Open filing evidence |
| 2026-01-01 – 2026-06-30 | 231000000 | USD | 2026-07-31 · 20:15:25.000Z | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 116000000 | USD | 2026-07-31 · 20:15:25.000Z | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 246000000 | USD | 2026-07-31 · 20:15:25.000Z | Open filing evidence |
Operating Segments · Insurance Domestic Segment
Consolidation Items · Statement Business Segments
Source dimensions
us-gaap:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;us-gaap:StatementBusinessSegmentsAxis=wrb:InsuranceDomesticSegmentMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2018-01-01 – 2018-12-31 | 6456441000 | USD | 2019-02-22 · 21:13:46.000Z | Open filing evidence |
| 2018-07-01 – 2018-09-30 | 1654424000 | USD | 2018-11-08 · 21:10:09.000Z | Open filing evidence |
| 2018-01-01 – 2018-09-30 | 4830640000 | USD | 2018-11-08 · 21:10:09.000Z | Open filing evidence |
| 2018-04-01 – 2018-06-30 | 1589048000 | USD | 2018-08-06 · 20:17:54.000Z | Open filing evidence |
| 2018-01-01 – 2018-06-30 | 3176215000 | USD | 2018-08-06 · 20:17:54.000Z | Open filing evidence |
| 2018-01-01 – 2018-03-31 | 1587167000 | USD | 2018-05-07 · 20:11:00.000Z | Open filing evidence |
| 2017-01-01 – 2017-12-31 | 6229485000 | USD | 2019-02-22 · 21:13:46.000Z | Open filing evidence |
| 2017-07-01 – 2017-09-30 | 1539653000 | USD | 2018-11-08 · 21:10:09.000Z | Open filing evidence |
| 2017-01-01 – 2017-09-30 | 4583037000 | USD | 2018-11-08 · 21:10:09.000Z | Open filing evidence |
| 2017-04-01 – 2017-06-30 | 1541289000 | USD | 2018-08-06 · 20:17:54.000Z | Open filing evidence |
| 2017-01-01 – 2017-06-30 | 3084654000 | USD | 2018-08-06 · 20:17:54.000Z | Open filing evidence |
| 2017-01-01 – 2017-03-31 | 1543366000 | USD | 2018-05-07 · 20:11:00.000Z | Open filing evidence |
| 2016-01-01 – 2016-12-31 | 6148210000 Restated | USD | 2019-02-22 · 21:13:46.000Z | Open filing evidence |
| 2016-07-01 – 2016-09-30 | 1534935000 Restated | USD | 2017-11-08 · 21:09:56.000Z | Open filing evidence |
| 2016-01-01 – 2016-09-30 | 4485889000 Restated | USD | 2017-11-08 · 21:09:56.000Z | Open filing evidence |
| 2016-04-01 – 2016-06-30 | 1512502000 Restated | USD | 2017-08-07 · 20:33:11.000Z | Open filing evidence |
| 2016-01-01 – 2016-06-30 | 3005351000 Restated | USD | 2017-08-07 · 20:33:11.000Z | Open filing evidence |
| 2016-01-01 – 2016-03-31 | 1493258000 Restated | USD | 2017-05-05 · 20:22:09.000Z | Open filing evidence |
| 2015-01-01 – 2015-12-31 | 5876454000 Restated | USD | 2018-02-23 · 21:41:12.000Z | Open filing evidence |
| 2015-07-01 – 2015-09-30 | 1509511000 Restated | USD | 2016-11-07 · 21:30:47.000Z | Open filing evidence |
| 2015-01-01 – 2015-09-30 | 4424477000 Restated | USD | 2016-11-07 · 21:30:47.000Z | Open filing evidence |
| 2015-04-01 – 2015-06-30 | 1479031000 Restated | USD | 2016-08-05 · 21:27:27.000Z | Open filing evidence |
| 2015-01-01 – 2015-06-30 | 2914966000 Restated | USD | 2016-08-05 · 21:27:27.000Z | Open filing evidence |
| 2015-01-01 – 2015-03-31 | 1435935000 Restated | USD | 2016-05-10 · 18:58:33.000Z | Open filing evidence |
| 2014-01-01 – 2014-12-31 | 5665200000 Restated | USD | 2017-02-27 · 22:34:39.000Z | Open filing evidence |
| 2014-07-01 – 2014-09-30 | 1245754000 | USD | 2015-11-09 · 21:20:42.000Z | Open filing evidence |
| 2014-01-01 – 2014-09-30 | 3567967000 | USD | 2015-11-09 · 21:20:42.000Z | Open filing evidence |
| 2014-04-01 – 2014-06-30 | 1171803000 | USD | 2015-08-06 · 21:52:41.000Z | Open filing evidence |
| 2014-01-01 – 2014-06-30 | 2322213000 | USD | 2015-08-06 · 21:52:41.000Z | Open filing evidence |
| 2014-01-01 – 2014-03-31 | 1150410000 | USD | 2015-05-04 · 15:29:46.000Z | Open filing evidence |
| 2013-01-01 – 2013-12-31 | 5064403000 Restated | USD | 2016-05-10 · 18:58:33.000Z | Open filing evidence |
| 2013-07-01 – 2013-09-30 | 1079190000 | USD | 2014-11-07 · 14:30:02.000Z | Open filing evidence |
| 2013-01-01 – 2013-09-30 | 3149312000 | USD | 2014-11-07 · 14:30:02.000Z | Open filing evidence |
| 2013-04-01 – 2013-06-30 | 1061211000 | USD | 2014-08-07 · 15:41:36.000Z | Open filing evidence |
| 2013-01-01 – 2013-06-30 | 2070122000 | USD | 2014-08-07 · 15:41:36.000Z | Open filing evidence |
| 2013-01-01 – 2013-03-31 | 1008911000 | USD | 2014-05-12 · 16:37:25.000Z | Open filing evidence |
| 2012-01-01 – 2012-12-31 | 3944942000 | USD | 2015-02-27 · 21:09:48.000Z | Open filing evidence |
| 2012-01-01 – 2012-09-30 | 2923066000 | USD | 2013-11-08 · 22:06:32.000Z | Open filing evidence |
| 2012-04-01 – 2012-06-30 | 982608000 Restated | USD | 2013-11-08 · 22:06:32.000Z | Open filing evidence |
| 2012-01-01 – 2012-06-30 | 1940458000 | USD | 2013-08-06 · 18:08:21.000Z | Open filing evidence |
| 2011-01-01 – 2011-12-31 | 3586181000 | USD | 2014-02-28 · 21:51:18.000Z | Open filing evidence |
Operating Segments · Insurance Domestic Segment · Non Us
Consolidation Items · Statement Business Segments · Statement Geographical
Source dimensions
us-gaap:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;us-gaap:StatementBusinessSegmentsAxis=wrb:InsuranceDomesticSegmentMember;us-gaap:StatementGeographicalAxis=us-gaap:NonUsMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2018-01-01 – 2018-12-31 | 714200000 | USD | 2019-02-22 · 21:13:46.000Z | Open filing evidence |
| 2017-01-01 – 2017-12-31 | 688200000 | USD | 2019-02-22 · 21:13:46.000Z | Open filing evidence |
| 2016-01-01 – 2016-12-31 | 733300000 | USD | 2019-02-22 · 21:13:46.000Z | Open filing evidence |
| 2015-01-01 – 2015-12-31 | 786900000 | USD | 2018-02-23 · 21:41:12.000Z | Open filing evidence |
Operating Segments · Insurance International Segment
Consolidation Items · Statement Business Segments
Source dimensions
us-gaap:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;us-gaap:StatementBusinessSegmentsAxis=wrb:InsuranceInternationalSegmentMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2018-07-01 – 2018-09-30 | 176000000 | USD | 2018-11-08 · 21:10:09.000Z | Open filing evidence |
| 2018-01-01 – 2018-09-30 | 535000000 | USD | 2018-11-08 · 21:10:09.000Z | Open filing evidence |
| 2018-04-01 – 2018-06-30 | 176000000 | USD | 2018-08-06 · 20:17:54.000Z | Open filing evidence |
| 2018-01-01 – 2018-06-30 | 359000000 | USD | 2018-08-06 · 20:17:54.000Z | Open filing evidence |
| 2018-01-01 – 2018-03-31 | 183000000 | USD | 2018-05-07 · 20:11:00.000Z | Open filing evidence |
| 2017-07-01 – 2017-09-30 | 166000000 | USD | 2018-11-08 · 21:10:09.000Z | Open filing evidence |
| 2017-01-01 – 2017-09-30 | 513000000 | USD | 2018-11-08 · 21:10:09.000Z | Open filing evidence |
| 2017-04-01 – 2017-06-30 | 168000000 | USD | 2018-08-06 · 20:17:54.000Z | Open filing evidence |
| 2017-01-01 – 2017-06-30 | 347000000 | USD | 2018-08-06 · 20:17:54.000Z | Open filing evidence |
| 2017-01-01 – 2017-03-31 | 184000000 | USD | 2018-05-07 · 20:11:00.000Z | Open filing evidence |
| 2016-07-01 – 2016-09-30 | 187000000 | USD | 2017-11-08 · 21:09:56.000Z | Open filing evidence |
| 2016-01-01 – 2016-09-30 | 546000000 | USD | 2017-11-08 · 21:09:56.000Z | Open filing evidence |
| 2016-04-01 – 2016-06-30 | 179000000 | USD | 2017-08-07 · 20:33:11.000Z | Open filing evidence |
| 2016-01-01 – 2016-06-30 | 359000000 | USD | 2017-08-07 · 20:33:11.000Z | Open filing evidence |
| 2015-01-01 – 2015-12-31 | 823663000 | USD | 2016-02-22 · 22:25:35.000Z | Open filing evidence |
| 2015-07-01 – 2015-09-30 | 211173000 | USD | 2015-11-09 · 21:20:42.000Z | Open filing evidence |
| 2015-01-01 – 2015-09-30 | 623218000 | USD | 2015-11-09 · 21:20:42.000Z | Open filing evidence |
| 2015-04-01 – 2015-06-30 | 201879000 | USD | 2015-08-06 · 21:52:41.000Z | Open filing evidence |
| 2015-01-01 – 2015-06-30 | 412045000 | USD | 2015-08-06 · 21:52:41.000Z | Open filing evidence |
| 2015-01-01 – 2015-03-31 | 210166000 | USD | 2015-05-04 · 15:29:46.000Z | Open filing evidence |
| 2014-01-01 – 2014-12-31 | 857782000 | USD | 2016-02-22 · 22:25:35.000Z | Open filing evidence |
| 2014-07-01 – 2014-09-30 | 225486000 | USD | 2015-11-09 · 21:20:42.000Z | Open filing evidence |
| 2014-01-01 – 2014-09-30 | 640606000 | USD | 2015-11-09 · 21:20:42.000Z | Open filing evidence |
| 2014-04-01 – 2014-06-30 | 213144000 | USD | 2015-08-06 · 21:52:41.000Z | Open filing evidence |
| 2014-01-01 – 2014-06-30 | 415120000 | USD | 2015-08-06 · 21:52:41.000Z | Open filing evidence |
| 2014-01-01 – 2014-03-31 | 201976000 | USD | 2015-05-04 · 15:29:46.000Z | Open filing evidence |
| 2013-01-01 – 2013-12-31 | 770190000 | USD | 2016-02-22 · 22:25:35.000Z | Open filing evidence |
| 2013-07-01 – 2013-09-30 | 200205000 | USD | 2014-11-07 · 14:30:02.000Z | Open filing evidence |
| 2013-01-01 – 2013-09-30 | 576748000 | USD | 2014-11-07 · 14:30:02.000Z | Open filing evidence |
| 2013-04-01 – 2013-06-30 | 193363000 | USD | 2014-08-07 · 15:41:36.000Z | Open filing evidence |
| 2013-01-01 – 2013-06-30 | 376543000 | USD | 2014-08-07 · 15:41:36.000Z | Open filing evidence |
| 2013-01-01 – 2013-03-31 | 183180000 | USD | 2014-05-12 · 16:37:25.000Z | Open filing evidence |
| 2012-01-01 – 2012-12-31 | 677637000 | USD | 2015-02-27 · 21:09:48.000Z | Open filing evidence |
| 2012-01-01 – 2012-09-30 | 488095000 | USD | 2013-11-08 · 22:06:32.000Z | Open filing evidence |
| 2012-04-01 – 2012-06-30 | 168184000 Restated | USD | 2013-11-08 · 22:06:32.000Z | Open filing evidence |
| 2012-01-01 – 2012-06-30 | 319911000 | USD | 2013-08-06 · 18:08:21.000Z | Open filing evidence |
| 2011-01-01 – 2011-12-31 | 545467000 | USD | 2014-02-28 · 21:51:18.000Z | Open filing evidence |
Operating Segments · Reinsurance Global Segment
Consolidation Items · Statement Business Segments
Source dimensions
us-gaap:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;us-gaap:StatementBusinessSegmentsAxis=wrb:ReinsuranceGlobalSegmentMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2018-01-01 – 2018-12-31 | 600815000 | USD | 2019-02-22 · 21:13:46.000Z | Open filing evidence |
| 2018-07-01 – 2018-09-30 | 138653000 | USD | 2018-11-08 · 21:10:09.000Z | Open filing evidence |
| 2018-01-01 – 2018-09-30 | 445543000 | USD | 2018-11-08 · 21:10:09.000Z | Open filing evidence |
| 2018-04-01 – 2018-06-30 | 147168000 | USD | 2018-08-06 · 20:17:54.000Z | Open filing evidence |
| 2018-01-01 – 2018-06-30 | 306889000 | USD | 2018-08-06 · 20:17:54.000Z | Open filing evidence |
| 2018-01-01 – 2018-03-31 | 159721000 | USD | 2018-05-07 · 20:11:00.000Z | Open filing evidence |
| 2017-01-01 – 2017-12-31 | 696122000 | USD | 2019-02-22 · 21:13:46.000Z | Open filing evidence |
| 2017-07-01 – 2017-09-30 | 169299000 | USD | 2018-11-08 · 21:10:09.000Z | Open filing evidence |
| 2017-01-01 – 2017-09-30 | 525557000 | USD | 2018-11-08 · 21:10:09.000Z | Open filing evidence |
| 2017-04-01 – 2017-06-30 | 174608000 | USD | 2018-08-06 · 20:17:54.000Z | Open filing evidence |
| 2017-01-01 – 2017-06-30 | 356258000 | USD | 2018-08-06 · 20:17:54.000Z | Open filing evidence |
| 2017-01-01 – 2017-03-31 | 181650000 | USD | 2018-05-07 · 20:11:00.000Z | Open filing evidence |
| 2016-01-01 – 2016-12-31 | 777123000 Restated | USD | 2019-02-22 · 21:13:46.000Z | Open filing evidence |
| 2016-07-01 – 2016-09-30 | 189876000 Restated | USD | 2017-11-08 · 21:09:56.000Z | Open filing evidence |
| 2016-01-01 – 2016-09-30 | 569206000 Restated | USD | 2017-11-08 · 21:09:56.000Z | Open filing evidence |
| 2016-04-01 – 2016-06-30 | 194421000 Restated | USD | 2017-08-07 · 20:33:11.000Z | Open filing evidence |
| 2016-01-01 – 2016-06-30 | 379330000 Restated | USD | 2017-08-07 · 20:33:11.000Z | Open filing evidence |
| 2016-01-01 – 2016-03-31 | 184500000 Restated | USD | 2017-05-05 · 20:22:09.000Z | Open filing evidence |
| 2015-01-01 – 2015-12-31 | 745325000 Restated | USD | 2018-02-23 · 21:41:12.000Z | Open filing evidence |
| 2015-07-01 – 2015-09-30 | 171525000 | USD | 2016-11-07 · 21:30:47.000Z | Open filing evidence |
| 2015-01-01 – 2015-09-30 | 509028000 | USD | 2016-11-07 · 21:30:47.000Z | Open filing evidence |
| 2015-04-01 – 2015-06-30 | 159725000 | USD | 2016-08-05 · 21:27:27.000Z | Open filing evidence |
| 2015-01-01 – 2015-06-30 | 337503000 | USD | 2016-08-05 · 21:27:27.000Z | Open filing evidence |
| 2015-01-01 – 2015-03-31 | 177778000 | USD | 2016-05-10 · 18:58:33.000Z | Open filing evidence |
| 2014-01-01 – 2014-12-31 | 758931000 | USD | 2017-02-27 · 22:34:39.000Z | Open filing evidence |
| 2014-07-01 – 2014-09-30 | 188637000 | USD | 2015-11-09 · 21:20:42.000Z | Open filing evidence |
| 2014-01-01 – 2014-09-30 | 582636000 | USD | 2015-11-09 · 21:20:42.000Z | Open filing evidence |
| 2014-04-01 – 2014-06-30 | 191640000 | USD | 2015-08-06 · 21:52:41.000Z | Open filing evidence |
| 2014-01-01 – 2014-06-30 | 393999000 | USD | 2015-08-06 · 21:52:41.000Z | Open filing evidence |
| 2014-01-01 – 2014-03-31 | 202359000 | USD | 2015-05-04 · 15:29:46.000Z | Open filing evidence |
| 2013-01-01 – 2013-12-31 | 810060000 | USD | 2016-05-10 · 18:58:33.000Z | Open filing evidence |
| 2013-07-01 – 2013-09-30 | 200935000 | USD | 2014-11-07 · 14:30:02.000Z | Open filing evidence |
| 2013-01-01 – 2013-09-30 | 599418000 | USD | 2014-11-07 · 14:30:02.000Z | Open filing evidence |
| 2013-04-01 – 2013-06-30 | 199362000 | USD | 2014-08-07 · 15:41:36.000Z | Open filing evidence |
| 2013-01-01 – 2013-06-30 | 398483000 | USD | 2014-08-07 · 15:41:36.000Z | Open filing evidence |
| 2013-01-01 – 2013-03-31 | 199121000 | USD | 2014-05-12 · 16:37:25.000Z | Open filing evidence |
| 2012-01-01 – 2012-12-31 | 731585000 | USD | 2015-02-27 · 21:09:48.000Z | Open filing evidence |
| 2012-01-01 – 2012-09-30 | 525031000 | USD | 2013-11-08 · 22:06:32.000Z | Open filing evidence |
| 2012-04-01 – 2012-06-30 | 176074000 Restated | USD | 2013-11-08 · 22:06:32.000Z | Open filing evidence |
| 2012-01-01 – 2012-06-30 | 348957000 | USD | 2013-08-06 · 18:08:21.000Z | Open filing evidence |
| 2011-01-01 – 2011-12-31 | 628872000 | USD | 2014-02-28 · 21:51:18.000Z | Open filing evidence |
Operating Segments · Reinsurance Global Segment · Non Us
Consolidation Items · Statement Business Segments · Statement Geographical
Source dimensions
us-gaap:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;us-gaap:StatementBusinessSegmentsAxis=wrb:ReinsuranceGlobalSegmentMember;us-gaap:StatementGeographicalAxis=us-gaap:NonUsMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2018-01-01 – 2018-12-31 | 228100000 | USD | 2019-02-22 · 21:13:46.000Z | Open filing evidence |
| 2017-01-01 – 2017-12-31 | 201300000 | USD | 2019-02-22 · 21:13:46.000Z | Open filing evidence |
| 2016-01-01 – 2016-12-31 | 200500000 | USD | 2019-02-22 · 21:13:46.000Z | Open filing evidence |
| 2015-01-01 – 2015-12-31 | 223400000 | USD | 2018-02-23 · 21:41:12.000Z | Open filing evidence |
Operating Segments · Reinsurance International
Consolidation Items · Statement Business Segments
Source dimensions
us-gaap:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;us-gaap:StatementBusinessSegmentsAxis=wrb:ReinsuranceInternationalMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2018-07-01 – 2018-09-30 | 51000000 | USD | 2018-11-08 · 21:10:09.000Z | Open filing evidence |
| 2018-01-01 – 2018-09-30 | 163000000 | USD | 2018-11-08 · 21:10:09.000Z | Open filing evidence |
| 2018-04-01 – 2018-06-30 | 55000000 | USD | 2018-08-06 · 20:17:54.000Z | Open filing evidence |
| 2018-01-01 – 2018-06-30 | 112000000 | USD | 2018-08-06 · 20:17:54.000Z | Open filing evidence |
| 2018-01-01 – 2018-03-31 | 56000000 | USD | 2018-05-07 · 20:11:00.000Z | Open filing evidence |
| 2017-07-01 – 2017-09-30 | 49000000 | USD | 2018-11-08 · 21:10:09.000Z | Open filing evidence |
| 2017-01-01 – 2017-09-30 | 150000000 | USD | 2018-11-08 · 21:10:09.000Z | Open filing evidence |
| 2017-04-01 – 2017-06-30 | 50000000 | USD | 2018-08-06 · 20:17:54.000Z | Open filing evidence |
| 2017-01-01 – 2017-06-30 | 101000000 | USD | 2018-08-06 · 20:17:54.000Z | Open filing evidence |
| 2017-01-01 – 2017-03-31 | 49000000 | USD | 2018-05-07 · 20:11:00.000Z | Open filing evidence |
| 2016-07-01 – 2016-09-30 | 48000000 | USD | 2017-11-08 · 21:09:56.000Z | Open filing evidence |
| 2016-01-01 – 2016-09-30 | 153000000 | USD | 2017-11-08 · 21:09:56.000Z | Open filing evidence |
| 2016-04-01 – 2016-06-30 | 50000000 | USD | 2017-08-07 · 20:33:11.000Z | Open filing evidence |
| 2016-01-01 – 2016-06-30 | 105000000 | USD | 2017-08-07 · 20:33:11.000Z | Open filing evidence |
Consolidation Items Domain
Statement Business Segments
Source dimensions
us-gaap:StatementBusinessSegmentsAxis=us-gaap:ConsolidationItemsDomain| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2016-01-01 – 2016-12-31 | 7654184000 | USD | 2017-02-27 · 22:34:39.000Z | Open filing evidence |
| 2015-01-01 – 2015-12-31 | 7206457000 | USD | 2017-02-27 · 22:34:39.000Z | Open filing evidence |
| 2014-01-01 – 2014-12-31 | 7128928000 | USD | 2017-02-27 · 22:34:39.000Z | Open filing evidence |
Alternative Markets Segment
Statement Business Segments
Multiple units reported for the same period; values are kept separate.
Source dimensions
us-gaap:StatementBusinessSegmentsAxis=wrb:AlternativeMarketsSegmentMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2012-01-01 – 2012-12-31 | 930867000 | USD | 20130228 | Open filing evidence |
| 2012-07-01 – 2012-09-30 | 231123000 | USD | 20121108 | Open filing evidence |
| 2012-01-01 – 2012-09-30 | 692748000 | USD | 20121108 | Open filing evidence |
| 2012-04-01 – 2012-06-30 | 239575000 | USD | 20120808 | Open filing evidence |
| 2012-01-01 – 2012-06-30 | 461625000 | USD | 20120808 | Open filing evidence |
| 2012-01-01 – 2012-03-31 | 222050000 | USD | 20120507 | Open filing evidence |
| 2011-01-01 – 2011-12-31 | 819949000 | USD | 20130228 | Open filing evidence |
| 2011-07-01 – 2011-09-30 | 203159000 | USD | 20121108 | Open filing evidence |
| 2011-01-01 – 2011-09-30 | 614277000 | USD | 20121108 | Open filing evidence |
| 2011-04-01 – 2011-06-30 | 207581000 | Unit12 | 20110805 | Open filing evidence |
| 2011-04-01 – 2011-06-30 | 207581000 | USD | 20120808 | Open filing evidence |
| 2011-01-01 – 2011-06-30 | 411118000 | Unit12 | 20110805 | Open filing evidence |
| 2011-01-01 – 2011-03-31 | 411118000 Restated | USD | 20120808 | Open filing evidence |
| 2010-01-01 – 2010-12-31 | 810673000 | USD | 20130228 | Open filing evidence |
| 2010-07-01 – 2010-09-30 | 197597000 | USD | 20111107 | Open filing evidence |
| 2010-01-01 – 2010-09-30 | 608728000 | USD | 20111107 | Open filing evidence |
| 2010-04-01 – 2010-06-30 | 203736000 | Unit12 | 20110805 | Open filing evidence |
| 2010-01-01 – 2010-06-30 | 411131000 | Unit12 | 20110805 | Open filing evidence |
| 2009-01-01 – 2009-12-31 | 768683000 | USD | 20120228 | Open filing evidence |
Corporate Other And Eliminations Segment
Statement Business Segments
Multiple units reported for the same period; values are kept separate.
Source dimensions
us-gaap:StatementBusinessSegmentsAxis=wrb:CorporateOtherAndEliminationsSegmentMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2013-01-01 – 2013-03-31 | 95588000 | USD | 20130506 | Open filing evidence |
| 2012-01-01 – 2012-12-31 | 258925000 | USD | 20130506 | Open filing evidence |
| 2012-07-01 – 2012-09-30 | 71409000 | USD | 20121108 | Open filing evidence |
| 2012-01-01 – 2012-09-30 | 184758000 | USD | 20121108 | Open filing evidence |
| 2012-04-01 – 2012-06-30 | 56767000 | USD | 20120808 | Open filing evidence |
| 2012-01-01 – 2012-06-30 | 113349000 | USD | 20120808 | Open filing evidence |
| 2012-01-01 – 2012-03-31 | 56582000 | USD | 20130506 | Open filing evidence |
| 2011-01-01 – 2011-12-31 | 269983000 | USD | 20130506 | Open filing evidence |
| 2011-07-01 – 2011-09-30 | 71541000 | USD | 20121108 | Open filing evidence |
| 2011-01-01 – 2011-09-30 | 187243000 | USD | 20121108 | Open filing evidence |
| 2011-04-01 – 2011-06-30 | 59692000 | Unit12 | 20110805 | Open filing evidence |
| 2011-04-01 – 2011-06-30 | 59692000 | USD | 20120808 | Open filing evidence |
| 2011-01-01 – 2011-06-30 | 115702000 | Unit12 | 20110805 | Open filing evidence |
| 2011-01-01 – 2011-03-31 | 115702000 Restated | USD | 20120808 | Open filing evidence |
| 2010-01-01 – 2010-12-31 | 224833000 | USD | 20130506 | Open filing evidence |
| 2010-07-01 – 2010-09-30 | 65569000 | USD | 20111107 | Open filing evidence |
| 2010-01-01 – 2010-09-30 | 175037000 | USD | 20111107 | Open filing evidence |
| 2010-04-01 – 2010-06-30 | 54594000 | Unit12 | 20110805 | Open filing evidence |
| 2010-01-01 – 2010-06-30 | 109468000 | Unit12 | 20110805 | Open filing evidence |
| 2009-01-01 – 2009-12-31 | 201548000 | USD | 20120228 | Open filing evidence |
Insurance Domestic Segment · Operating Segments
Statement Business Segments · Consolidation Items
Source dimensions
us-gaap:StatementBusinessSegmentsAxis=wrb:InsuranceDomesticSegmentMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2024-04-01 – 2024-06-30 | 2797721000 | USD | 2024-08-02 · 20:11:08.000Z | Open filing evidence |
| 2024-01-01 – 2024-06-30 | 5450690000 | USD | 2024-08-02 · 20:11:08.000Z | Open filing evidence |
| 2023-01-01 – 2023-12-31 | 9961152000 | USD | 2024-02-23 · 21:09:29.000Z | Open filing evidence |
| 2023-07-01 – 2023-09-30 | 2535370000 | USD | 2023-11-03 · 20:11:31.000Z | Open filing evidence |
| 2023-01-01 – 2023-09-30 | 7335456000 | USD | 2023-11-03 · 20:11:31.000Z | Open filing evidence |
| 2023-04-01 – 2023-06-30 | 2409366000 | USD | 2024-08-02 · 20:11:08.000Z | Open filing evidence |
| 2023-01-01 – 2023-06-30 | 4725423000 | USD | 2024-08-02 · 20:11:08.000Z | Open filing evidence |
| 2023-01-01 – 2023-03-31 | 2357539000 | USD | 2023-05-04 · 20:18:03.000Z | Open filing evidence |
| 2022-01-01 – 2022-12-31 | 8952493000 | USD | 2024-02-23 · 21:09:29.000Z | Open filing evidence |
| 2022-07-01 – 2022-09-30 | 2271874000 | USD | 2023-11-03 · 20:11:31.000Z | Open filing evidence |
| 2022-01-01 – 2022-09-30 | 6573656000 | USD | 2023-11-03 · 20:11:31.000Z | Open filing evidence |
| 2022-04-01 – 2022-06-30 | 2192616000 | USD | 2022-08-02 · 20:21:31.000Z | Open filing evidence |
| 2022-01-01 – 2022-06-30 | 4301781000 | USD | 2022-08-02 · 20:21:31.000Z | Open filing evidence |
| 2022-01-01 – 2022-03-31 | 2109165000 | USD | 2023-05-04 · 20:18:03.000Z | Open filing evidence |
| 2021-01-01 – 2021-12-31 | 7578592000 | USD | 2024-02-23 · 21:09:29.000Z | Open filing evidence |
| 2021-07-01 – 2021-09-30 | 1945130000 | USD | 2022-11-04 · 20:15:44.000Z | Open filing evidence |
| 2021-01-01 – 2021-09-30 | 5515743000 | USD | 2022-11-04 · 20:15:44.000Z | Open filing evidence |
| 2021-04-01 – 2021-06-30 | 1852117000 | USD | 2022-08-02 · 20:21:31.000Z | Open filing evidence |
| 2021-01-01 – 2021-06-30 | 3570612000 | USD | 2022-08-02 · 20:21:31.000Z | Open filing evidence |
| 2021-01-01 – 2021-03-31 | 1718495000 | USD | 2022-05-03 · 20:18:51.000Z | Open filing evidence |
| 2020-01-01 – 2020-12-31 | 6478834000 | USD | 2023-02-24 · 13:37:12.000Z | Open filing evidence |
| 2020-07-01 – 2020-09-30 | 1628384000 | USD | 2020-11-05 · 21:21:25.000Z | Open filing evidence |
| 2020-01-01 – 2020-09-30 | 4762437000 | USD | 2020-11-05 · 21:21:25.000Z | Open filing evidence |
| 2020-04-01 – 2020-06-30 | 1517167000 | USD | 2021-08-02 · 20:10:18.000Z | Open filing evidence |
| 2020-01-01 – 2020-06-30 | 3134053000 | USD | 2021-08-02 · 20:10:18.000Z | Open filing evidence |
| 2020-01-01 – 2020-03-31 | 1616886000 | USD | 2021-05-05 · 20:16:48.000Z | Open filing evidence |
| 2019-01-01 – 2019-12-31 | 6397074000 | USD | 2022-02-24 · 21:51:04.000Z | Open filing evidence |
| 2019-07-01 – 2019-09-30 | 1605093000 | USD | 2020-11-05 · 21:21:25.000Z | Open filing evidence |
| 2019-01-01 – 2019-09-30 | 4766685000 | USD | 2020-11-05 · 21:21:25.000Z | Open filing evidence |
| 2019-04-01 – 2019-06-30 | 1621274000 | USD | 2020-08-03 · 20:16:12.000Z | Open filing evidence |
| 2019-01-01 – 2019-06-30 | 3161593000 | USD | 2020-08-03 · 20:16:12.000Z | Open filing evidence |
Insurance Domestic Segment · Operating Segments · Non Us
Statement Business Segments · Consolidation Items · Statement Geographical
Source dimensions
us-gaap:StatementBusinessSegmentsAxis=wrb:InsuranceDomesticSegmentMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;srt:StatementGeographicalAxis=us-gaap:NonUsMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2024-04-01 – 2024-06-30 | 368000000 | USD | 2024-08-02 · 20:11:08.000Z | Open filing evidence |
| 2024-01-01 – 2024-06-30 | 762000000 | USD | 2024-08-02 · 20:11:08.000Z | Open filing evidence |
| 2023-04-01 – 2023-06-30 | 280000000 | USD | 2024-08-02 · 20:11:08.000Z | Open filing evidence |
| 2023-01-01 – 2023-06-30 | 554000000 | USD | 2024-08-02 · 20:11:08.000Z | Open filing evidence |
| 2023-01-01 – 2023-03-31 | 274000000 | USD | 2023-05-04 · 20:18:03.000Z | Open filing evidence |
| 2022-01-01 – 2022-12-31 | 1029000000 | USD | 2023-02-24 · 13:37:12.000Z | Open filing evidence |
| 2022-01-01 – 2022-03-31 | 235000000 | USD | 2023-05-04 · 20:18:03.000Z | Open filing evidence |
| 2021-01-01 – 2021-12-31 | 873000000 | USD | 2023-02-24 · 13:37:12.000Z | Open filing evidence |
| 2020-01-01 – 2020-12-31 | 692000000 | USD | 2023-02-24 · 13:37:12.000Z | Open filing evidence |
Insurance Domestic Segment · Non Us · Operating Segments
Statement Business Segments · Statement Geographical · Consolidation Items
Source dimensions
us-gaap:StatementBusinessSegmentsAxis=wrb:InsuranceDomesticSegmentMember;srt:StatementGeographicalAxis=us-gaap:NonUsMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2023-01-01 – 2023-12-31 | 1171000000 | USD | 2024-02-23 · 21:09:29.000Z | Open filing evidence |
| 2022-01-01 – 2022-12-31 | 1029000000 | USD | 2024-02-23 · 21:09:29.000Z | Open filing evidence |
| 2021-01-01 – 2021-12-31 | 873000000 | USD | 2024-02-23 · 21:09:29.000Z | Open filing evidence |
| 2020-01-01 – 2020-12-31 | 692000000 | USD | 2022-02-24 · 21:51:04.000Z | Open filing evidence |
| 2019-01-01 – 2019-12-31 | 725000000 | USD | 2022-02-24 · 21:51:04.000Z | Open filing evidence |
Insurance Domestic Segment Member Domain
Statement Business Segments
Source dimensions
us-gaap:StatementBusinessSegmentsAxis=wrb:InsuranceDomesticSegmentMemberDomain| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2013-01-01 – 2013-03-31 | 1008911000 | USD | 20130506 | Open filing evidence |
| 2012-01-01 – 2012-12-31 | 3944942000 | USD | 20130506 | Open filing evidence |
| 2012-01-01 – 2012-03-31 | 946032000 | USD | 20130506 | Open filing evidence |
| 2011-01-01 – 2011-12-31 | 3586181000 | USD | 20130506 | Open filing evidence |
| 2010-01-01 – 2010-12-31 | 3434686000 | USD | 20130506 | Open filing evidence |
Insurance International Segment · Operating Segments
Statement Business Segments · Consolidation Items
Source dimensions
us-gaap:StatementBusinessSegmentsAxis=wrb:InsuranceInternationalSegmentMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2022-04-01 – 2022-06-30 | 263000000 | USD | 2022-08-02 · 20:21:31.000Z | Open filing evidence |
| 2022-01-01 – 2022-06-30 | 498000000 | USD | 2022-08-02 · 20:21:31.000Z | Open filing evidence |
| 2022-01-01 – 2022-03-31 | 235000000 | USD | 2022-05-03 · 20:18:51.000Z | Open filing evidence |
| 2021-04-01 – 2021-06-30 | 221000000 | USD | 2022-08-02 · 20:21:31.000Z | Open filing evidence |
| 2021-01-01 – 2021-06-30 | 418000000 | USD | 2022-08-02 · 20:21:31.000Z | Open filing evidence |
| 2021-01-01 – 2021-03-31 | 196000000 | USD | 2022-05-03 · 20:18:51.000Z | Open filing evidence |
| 2020-04-01 – 2020-06-30 | 149000000 | USD | 2021-08-02 · 20:10:18.000Z | Open filing evidence |
| 2020-01-01 – 2020-06-30 | 317000000 | USD | 2021-08-02 · 20:10:18.000Z | Open filing evidence |
| 2019-04-01 – 2019-06-30 | 179000000 | USD | 2020-08-03 · 20:16:12.000Z | Open filing evidence |
| 2019-01-01 – 2019-06-30 | 349000000 | USD | 2020-08-03 · 20:16:12.000Z | Open filing evidence |
Insurance International Segment Member Domain
Statement Business Segments
Source dimensions
us-gaap:StatementBusinessSegmentsAxis=wrb:InsuranceInternationalSegmentMemberDomain| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2013-01-01 – 2013-03-31 | 183180000 | USD | 20130506 | Open filing evidence |
| 2012-01-01 – 2012-12-31 | 677637000 | USD | 20130506 | Open filing evidence |
| 2012-01-01 – 2012-03-31 | 154216000 | USD | 20130506 | Open filing evidence |
| 2011-01-01 – 2011-12-31 | 545467000 | USD | 20130506 | Open filing evidence |
| 2010-01-01 – 2010-12-31 | 407704000 | USD | 20130506 | Open filing evidence |
International Segment
Statement Business Segments
Multiple units reported for the same period; values are kept separate.
Source dimensions
us-gaap:StatementBusinessSegmentsAxis=wrb:InternationalSegmentMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2012-01-01 – 2012-12-31 | 866160000 | USD | 20130228 | Open filing evidence |
| 2012-07-01 – 2012-09-30 | 213547000 | USD | 20121108 | Open filing evidence |
| 2012-01-01 – 2012-09-30 | 615239000 | USD | 20121108 | Open filing evidence |
| 2012-04-01 – 2012-06-30 | 205314000 | USD | 20120808 | Open filing evidence |
| 2012-01-01 – 2012-06-30 | 401692000 | USD | 20120808 | Open filing evidence |
| 2012-01-01 – 2012-03-31 | 196378000 | USD | 20120507 | Open filing evidence |
| 2011-01-01 – 2011-12-31 | 656460000 | USD | 20130228 | Open filing evidence |
| 2011-07-01 – 2011-09-30 | 171279000 | USD | 20121108 | Open filing evidence |
| 2011-01-01 – 2011-09-30 | 475890000 | USD | 20121108 | Open filing evidence |
| 2011-04-01 – 2011-06-30 | 157095000 | Unit12 | 20110805 | Open filing evidence |
| 2011-04-01 – 2011-06-30 | 157095000 | USD | 20120808 | Open filing evidence |
| 2011-01-01 – 2011-06-30 | 304611000 | Unit12 | 20110805 | Open filing evidence |
| 2011-01-01 – 2011-03-31 | 304611000 Restated | USD | 20120808 | Open filing evidence |
| 2010-01-01 – 2010-12-31 | 485534000 | USD | 20130228 | Open filing evidence |
| 2010-07-01 – 2010-09-30 | 129735000 | USD | 20111107 | Open filing evidence |
| 2010-01-01 – 2010-09-30 | 349841000 | USD | 20111107 | Open filing evidence |
| 2010-04-01 – 2010-06-30 | 113413000 | Unit12 | 20110805 | Open filing evidence |
| 2010-01-01 – 2010-06-30 | 220106000 | Unit12 | 20110805 | Open filing evidence |
| 2009-01-01 – 2009-12-31 | 351947000 | USD | 20120228 | Open filing evidence |
Net Investment Gains Segment
Statement Business Segments
Multiple units reported for the same period; values are kept separate.
Source dimensions
us-gaap:StatementBusinessSegmentsAxis=wrb:NetInvestmentGainsSegmentMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2013-01-01 – 2013-03-31 | 19969000 | USD | 20130506 | Open filing evidence |
| 2012-01-01 – 2012-12-31 | 210465000 | USD | 20130506 | Open filing evidence |
| 2012-07-01 – 2012-09-30 | 22226000 | USD | 20121108 | Open filing evidence |
| 2012-01-01 – 2012-09-30 | 94003000 | USD | 20121108 | Open filing evidence |
| 2012-04-01 – 2012-06-30 | 24286000 | USD | 20120808 | Open filing evidence |
| 2012-01-01 – 2012-06-30 | 71777000 | USD | 20120808 | Open filing evidence |
| 2012-01-01 – 2012-03-31 | 47491000 | USD | 20130506 | Open filing evidence |
| 2011-01-01 – 2011-12-31 | 125481000 | USD | 20130506 | Open filing evidence |
| 2011-07-01 – 2011-09-30 | 21238000 | USD | 20121108 | Open filing evidence |
| 2011-01-01 – 2011-09-30 | 73412000 | USD | 20121108 | Open filing evidence |
| 2011-04-01 – 2011-06-30 | 22890000 | Unit12 | 20110805 | Open filing evidence |
| 2011-04-01 – 2011-06-30 | 22890000 | USD | 20120808 | Open filing evidence |
| 2011-01-01 – 2011-06-30 | 52174000 | Unit12 | 20110805 | Open filing evidence |
| 2011-01-01 – 2011-03-31 | 52174000 Restated | USD | 20120808 | Open filing evidence |
| 2010-01-01 – 2010-12-31 | 56581000 | USD | 20130506 | Open filing evidence |
| 2010-07-01 – 2010-09-30 | 5204000 | USD | 20111107 | Open filing evidence |
| 2010-01-01 – 2010-09-30 | 22650000 | USD | 20111107 | Open filing evidence |
| 2010-04-01 – 2010-06-30 | 11534000 | Unit12 | 20110805 | Open filing evidence |
| 2010-01-01 – 2010-06-30 | 17446000 | Unit12 | 20110805 | Open filing evidence |
| 2009-01-01 – 2009-12-31 | -38408000 | USD | 20120228 | Open filing evidence |
Regional Segment
Statement Business Segments
Multiple units reported for the same period; values are kept separate.
Source dimensions
us-gaap:StatementBusinessSegmentsAxis=wrb:RegionalSegmentMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2012-01-01 – 2012-12-31 | 1178258000 | USD | 20130228 | Open filing evidence |
| 2012-07-01 – 2012-09-30 | 294498000 | USD | 20121108 | Open filing evidence |
| 2012-01-01 – 2012-09-30 | 874622000 | USD | 20121108 | Open filing evidence |
| 2012-04-01 – 2012-06-30 | 293176000 | USD | 20120808 | Open filing evidence |
| 2012-01-01 – 2012-06-30 | 580124000 | USD | 20120808 | Open filing evidence |
| 2012-01-01 – 2012-03-31 | 286948000 | USD | 20120507 | Open filing evidence |
| 2011-01-01 – 2011-12-31 | 1145491000 | USD | 20130228 | Open filing evidence |
| 2011-07-01 – 2011-09-30 | 284448000 | USD | 20121108 | Open filing evidence |
| 2011-01-01 – 2011-09-30 | 858259000 | USD | 20121108 | Open filing evidence |
| 2011-04-01 – 2011-06-30 | 289766000 | Unit12 | 20110805 | Open filing evidence |
| 2011-04-01 – 2011-06-30 | 289766000 | USD | 20120808 | Open filing evidence |
| 2011-01-01 – 2011-06-30 | 573811000 | Unit12 | 20110805 | Open filing evidence |
| 2011-01-01 – 2011-03-31 | 573811000 Restated | USD | 20120808 | Open filing evidence |
| 2010-01-01 – 2010-12-31 | 1152447000 | USD | 20130228 | Open filing evidence |
| 2010-07-01 – 2010-09-30 | 287284000 | USD | 20111107 | Open filing evidence |
| 2010-01-01 – 2010-09-30 | 861830000 | USD | 20111107 | Open filing evidence |
| 2010-04-01 – 2010-06-30 | 287009000 | Unit12 | 20110805 | Open filing evidence |
| 2010-01-01 – 2010-06-30 | 574546000 | Unit12 | 20110805 | Open filing evidence |
| 2009-01-01 – 2009-12-31 | 1177126000 | USD | 20120228 | Open filing evidence |
Reinsuranceand Monoline Excess Segment · Operating Segments
Statement Business Segments · Consolidation Items
Source dimensions
us-gaap:StatementBusinessSegmentsAxis=wrb:ReinsuranceandMonolineExcessSegmentMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2024-04-01 – 2024-06-30 | 420318000 | USD | 2024-08-02 · 20:11:08.000Z | Open filing evidence |
| 2024-01-01 – 2024-06-30 | 839107000 | USD | 2024-08-02 · 20:11:08.000Z | Open filing evidence |
| 2024-01-01 – 2024-03-31 | 418790000 | USD | 2024-05-03 · 20:11:43.000Z | Open filing evidence |
| 2023-01-01 – 2023-12-31 | 1481991000 | USD | 2024-02-23 · 21:09:29.000Z | Open filing evidence |
| 2023-04-01 – 2023-06-30 | 379728000 | USD | 2024-08-02 · 20:11:08.000Z | Open filing evidence |
| 2023-01-01 – 2023-06-30 | 782819000 | USD | 2024-08-02 · 20:11:08.000Z | Open filing evidence |
| 2023-01-01 – 2023-03-31 | 403091000 Restated | USD | 2024-05-03 · 20:11:43.000Z | Open filing evidence |
| 2022-01-01 – 2022-12-31 | 1386639000 | USD | 2024-02-23 · 21:09:29.000Z | Open filing evidence |
| 2022-04-01 – 2022-06-30 | 344112000 | USD | 2022-08-02 · 20:21:31.000Z | Open filing evidence |
| 2022-01-01 – 2022-06-30 | 657787000 | USD | 2022-08-02 · 20:21:31.000Z | Open filing evidence |
| 2022-01-01 – 2022-03-31 | 313675000 | USD | 2023-05-04 · 20:18:03.000Z | Open filing evidence |
| 2021-01-01 – 2021-12-31 | 1203647000 | USD | 2024-02-23 · 21:09:29.000Z | Open filing evidence |
| 2021-07-01 – 2021-09-30 | 310451000 | USD | 2021-11-04 · 20:20:42.000Z | Open filing evidence |
| 2021-01-01 – 2021-09-30 | 884437000 | USD | 2021-11-04 · 20:20:42.000Z | Open filing evidence |
| 2021-04-01 – 2021-06-30 | 291301000 | USD | 2022-08-02 · 20:21:31.000Z | Open filing evidence |
| 2021-01-01 – 2021-06-30 | 573986000 | USD | 2022-08-02 · 20:21:31.000Z | Open filing evidence |
| 2021-01-01 – 2021-03-31 | 282685000 | USD | 2022-05-03 · 20:18:51.000Z | Open filing evidence |
| 2020-01-01 – 2020-12-31 | 1009203000 | USD | 2021-02-18 · 22:21:32.000Z | Open filing evidence |
| 2020-07-01 – 2020-09-30 | 258134000 | USD | 2021-11-04 · 20:20:42.000Z | Open filing evidence |
| 2020-01-01 – 2020-09-30 | 737638000 | USD | 2021-11-04 · 20:20:42.000Z | Open filing evidence |
| 2020-04-01 – 2020-06-30 | 235332000 | USD | 2021-08-02 · 20:10:18.000Z | Open filing evidence |
| 2020-01-01 – 2020-06-30 | 479505000 | USD | 2021-08-02 · 20:10:18.000Z | Open filing evidence |
| 2019-01-01 – 2019-12-31 | 877551000 | USD | 2021-02-18 · 22:21:32.000Z | Open filing evidence |
| 2019-07-01 – 2019-09-30 | 226724000 | USD | 2020-11-05 · 21:21:25.000Z | Open filing evidence |
| 2019-01-01 – 2019-09-30 | 648227000 | USD | 2020-11-05 · 21:21:25.000Z | Open filing evidence |
| 2018-01-01 – 2018-12-31 | 848966000 | USD | 2021-02-18 · 22:21:32.000Z | Open filing evidence |
Reinsuranceand Monoline Excess Segment · Operating Segments · Non Us
Statement Business Segments · Consolidation Items · Statement Geographical
Source dimensions
us-gaap:StatementBusinessSegmentsAxis=wrb:ReinsuranceandMonolineExcessSegmentMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;srt:StatementGeographicalAxis=us-gaap:NonUsMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2024-04-01 – 2024-06-30 | 117000000 | USD | 2024-08-02 · 20:11:08.000Z | Open filing evidence |
| 2024-01-01 – 2024-06-30 | 228000000 | USD | 2024-08-02 · 20:11:08.000Z | Open filing evidence |
| 2023-04-01 – 2023-06-30 | 102000000 | USD | 2024-08-02 · 20:11:08.000Z | Open filing evidence |
| 2023-01-01 – 2023-06-30 | 209000000 | USD | 2024-08-02 · 20:11:08.000Z | Open filing evidence |
| 2023-01-01 – 2023-03-31 | 106000000 | USD | 2023-05-04 · 20:18:03.000Z | Open filing evidence |
| 2022-01-01 – 2022-03-31 | 96000000 | USD | 2023-05-04 · 20:18:03.000Z | Open filing evidence |
Reinsuranceand Monoline Excess Segment · Non Us · Operating Segments
Statement Business Segments · Statement Geographical · Consolidation Items
Source dimensions
us-gaap:StatementBusinessSegmentsAxis=wrb:ReinsuranceandMonolineExcessSegmentMember;srt:StatementGeographicalAxis=us-gaap:NonUsMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2024-01-01 – 2024-03-31 | 111000000 | USD | 2024-05-03 · 20:11:43.000Z | Open filing evidence |
| 2023-01-01 – 2023-12-31 | 463000000 | USD | 2024-02-23 · 21:09:29.000Z | Open filing evidence |
| 2023-01-01 – 2023-03-31 | 106000000 | USD | 2024-05-03 · 20:11:43.000Z | Open filing evidence |
| 2022-01-01 – 2022-12-31 | 412000000 | USD | 2024-02-23 · 21:09:29.000Z | Open filing evidence |
| 2021-01-01 – 2021-12-31 | 380000000 | USD | 2024-02-23 · 21:09:29.000Z | Open filing evidence |
| 2020-01-01 – 2020-12-31 | 291600000 | USD | 2021-02-18 · 22:21:32.000Z | Open filing evidence |
| 2019-01-01 – 2019-12-31 | 249600000 | USD | 2021-02-18 · 22:21:32.000Z | Open filing evidence |
| 2018-01-01 – 2018-12-31 | 228100000 | USD | 2021-02-18 · 22:21:32.000Z | Open filing evidence |
Reinsurance Global Segment Member Domain
Statement Business Segments
Source dimensions
us-gaap:StatementBusinessSegmentsAxis=wrb:ReinsuranceGlobalSegmentMemberDomain| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2013-01-01 – 2013-03-31 | 199121000 | USD | 20130506 | Open filing evidence |
| 2012-01-01 – 2012-12-31 | 731585000 | USD | 20130506 | Open filing evidence |
| 2012-01-01 – 2012-03-31 | 174384000 | USD | 20130506 | Open filing evidence |
| 2011-01-01 – 2011-12-31 | 628872000 | USD | 20130506 | Open filing evidence |
| 2010-01-01 – 2010-12-31 | 600265000 | USD | 20130506 | Open filing evidence |
Reinsurance International · Operating Segments
Statement Business Segments · Consolidation Items
Source dimensions
us-gaap:StatementBusinessSegmentsAxis=wrb:ReinsuranceInternationalMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2022-01-01 – 2022-03-31 | 96000000 | USD | 2022-05-03 · 20:18:51.000Z | Open filing evidence |
| 2021-01-01 – 2021-03-31 | 88000000 | USD | 2022-05-03 · 20:18:51.000Z | Open filing evidence |
| 2020-07-01 – 2020-09-30 | 77000000 | USD | 2020-11-05 · 21:21:25.000Z | Open filing evidence |
| 2020-01-01 – 2020-09-30 | 212000000 | USD | 2020-11-05 · 21:21:25.000Z | Open filing evidence |
| 2019-07-01 – 2019-09-30 | 65000000 | USD | 2020-11-05 · 21:21:25.000Z | Open filing evidence |
| 2019-01-01 – 2019-09-30 | 186000000 | USD | 2020-11-05 · 21:21:25.000Z | Open filing evidence |
Reinsurance Segment
Statement Business Segments
Multiple units reported for the same period; values are kept separate.
Source dimensions
us-gaap:StatementBusinessSegmentsAxis=wrb:ReinsuranceSegmentMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2012-01-01 – 2012-12-31 | 543062000 | USD | 20130228 | Open filing evidence |
| 2012-07-01 – 2012-09-30 | 130711000 | USD | 20121108 | Open filing evidence |
| 2012-01-01 – 2012-09-30 | 397887000 | USD | 20121108 | Open filing evidence |
| 2012-04-01 – 2012-06-30 | 134954000 | USD | 20120808 | Open filing evidence |
| 2012-01-01 – 2012-06-30 | 267176000 | USD | 20120808 | Open filing evidence |
| 2012-01-01 – 2012-03-31 | 132222000 | USD | 20120507 | Open filing evidence |
| 2011-01-01 – 2011-12-31 | 517879000 | USD | 20130228 | Open filing evidence |
| 2011-07-01 – 2011-09-30 | 122547000 | USD | 20121108 | Open filing evidence |
| 2011-01-01 – 2011-09-30 | 387450000 | USD | 20121108 | Open filing evidence |
| 2011-04-01 – 2011-06-30 | 132147000 | Unit12 | 20110805 | Open filing evidence |
| 2011-04-01 – 2011-06-30 | 132147000 | USD | 20120808 | Open filing evidence |
| 2011-01-01 – 2011-06-30 | 264903000 | Unit12 | 20110805 | Open filing evidence |
| 2011-01-01 – 2011-03-31 | 264903000 Restated | USD | 20120808 | Open filing evidence |
| 2010-01-01 – 2010-12-31 | 522435000 | USD | 20130228 | Open filing evidence |
| 2010-07-01 – 2010-09-30 | 122905000 | USD | 20111107 | Open filing evidence |
| 2010-01-01 – 2010-09-30 | 383526000 | USD | 20111107 | Open filing evidence |
| 2010-04-01 – 2010-06-30 | 132470000 | Unit12 | 20110805 | Open filing evidence |
| 2010-01-01 – 2010-06-30 | 260621000 | Unit12 | 20110805 | Open filing evidence |
| 2009-01-01 – 2009-12-31 | 487016000 | USD | 20120228 | Open filing evidence |
Specialty Segment
Statement Business Segments
Multiple units reported for the same period; values are kept separate.
Source dimensions
us-gaap:StatementBusinessSegmentsAxis=wrb:SpecialtySegmentMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2012-01-01 – 2012-12-31 | 1835817000 | USD | 20130228 | Open filing evidence |
| 2012-07-01 – 2012-09-30 | 456987000 | USD | 20121108 | Open filing evidence |
| 2012-01-01 – 2012-09-30 | 1355696000 | USD | 20121108 | Open filing evidence |
| 2012-04-01 – 2012-06-30 | 461675000 | USD | 20120808 | Open filing evidence |
| 2012-01-01 – 2012-06-30 | 898709000 | USD | 20120808 | Open filing evidence |
| 2012-01-01 – 2012-03-31 | 437034000 | USD | 20120507 | Open filing evidence |
| 2011-01-01 – 2011-12-31 | 1620741000 | USD | 20130228 | Open filing evidence |
| 2011-07-01 – 2011-09-30 | 405519000 | USD | 20121108 | Open filing evidence |
| 2011-01-01 – 2011-09-30 | 1188500000 | USD | 20121108 | Open filing evidence |
| 2011-04-01 – 2011-06-30 | 401778000 | Unit12 | 20110805 | Open filing evidence |
| 2011-04-01 – 2011-06-30 | 401778000 | USD | 20120808 | Open filing evidence |
| 2011-01-01 – 2011-06-30 | 782981000 | Unit12 | 20110805 | Open filing evidence |
| 2011-01-01 – 2011-03-31 | 782981000 Restated | USD | 20120808 | Open filing evidence |
| 2010-01-01 – 2010-12-31 | 1471566000 | USD | 20130228 | Open filing evidence |
| 2010-07-01 – 2010-09-30 | 367818000 | USD | 20111107 | Open filing evidence |
| 2010-01-01 – 2010-09-30 | 1091115000 | USD | 20111107 | Open filing evidence |
| 2010-04-01 – 2010-06-30 | 360312000 | Unit12 | 20110805 | Open filing evidence |
| 2010-01-01 – 2010-06-30 | 723297000 | Unit12 | 20110805 | Open filing evidence |
| 2009-01-01 – 2009-12-31 | 1483266000 | USD | 20120228 | Open filing evidence |