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Schedule II - Condensed Financial Information of Registrant (Balance Sheets (Parent Company)) (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | ---
Assets: |  |  |
Cash and cash equivalents | $ 1,449,346 | $ 1,568,843 |
Fixed maturity securities available for sale at fair value (cost $285,900 and $805,211 at December 31, 2022 and 2021, respectively) | 17,587,349 | 16,602,673 |
Loans receivable (net of allowance for expected credit losses of $559 and $647 at December 31, 2022 and 2021, respectively) | 193,002 | 115,172 |
Current federal income taxes | 39,123 | 23,570 |
Deferred federal and foreign income taxes | 340,647 | 57,425 |
Property, furniture and equipment at cost, less accumulated depreciation | 423,232 | 419,883 |
Other assets | 736,022 | 753,231 |
Total assets | 33,861,099 | 32,086,414 |
Liabilities: |  |  |
Other liabilities | 1,377,740 | 1,305,245 |
Current federal income taxes | 34,350 | 21,068 |
Deferred federal income taxes | 11,646 | 17,470 |
Subordinated debentures | 1,008,371 | 1,007,652 |
Total liabilities | 27,092,938 | 25,418,684 |
Stockholders' equity: |  |  |
Preferred stock | 0 | 0 |
Common stock | 105,803 | 105,803 |
Additional paid-in capital | 997,534 | 981,104 |
Retained earnings (including accumulated undistributed net income of subsidiaries of $7,975,360 and $6,463,882 at December 31, 2022 and 2021, respectively) | 10,161,005 | 9,015,135 |
Accumulated other comprehensive loss | (1,264,581) | (281,955) |
Treasury stock, at cost | (3,251,429) | (3,167,076) |
Total common stockholders’ equity | 6,748,332 | 6,653,011 |
Total liabilities and equity | 33,861,099 | 32,086,414 |
Fixed maturity securities available for sale at cost | 18,664,073 | 16,396,936 |
Financing receivable, allowance for credit loss | 1,791 | 1,718 | $ 5,437
Parent Company |  |  |
Assets: |  |  |
Cash and cash equivalents | 103,522 | 684,037 |
Fixed maturity securities available for sale at fair value (cost $285,900 and $805,211 at December 31, 2022 and 2021, respectively) | 275,511 | 806,074 |
Loans receivable (net of allowance for expected credit losses of $559 and $647 at December 31, 2022 and 2021, respectively) | 109,793 | 93,397 |
Equity securities, at fair value (cost $3,430 in both 2022 and 2021) | 3,430 | 3,430 |
Investment in subsidiaries | 8,888,455 | 8,516,916 |
Current federal income taxes | 34,452 | 23,424 |
Deferred federal and foreign income taxes | 304,191 | 11,796 |
Property, furniture and equipment at cost, less accumulated depreciation | 11,356 | 11,916 |
Other assets | 39,741 | 43,793 |
Total assets | 9,770,451 | 10,194,783 |
Liabilities: |  |  |
Due to subsidiaries | 53,029 | 138,376 |
Other liabilities | 139,150 | 146,892 |
Subordinated debentures | 1,008,371 | 1,007,652 |
Senior notes | 1,821,569 | 2,248,852 |
Total liabilities | 3,022,119 | 3,541,772 |
Stockholders' equity: |  |  |
Preferred stock | 0 | 0 |
Common stock | 105,803 | 105,803 |
Additional paid-in capital | 997,534 | 981,104 |
Retained earnings (including accumulated undistributed net income of subsidiaries of $7,975,360 and $6,463,882 at December 31, 2022 and 2021, respectively) | 10,161,005 | 9,015,135 |
Accumulated other comprehensive loss | (1,264,581) | (281,955) |
Treasury stock, at cost | (3,251,429) | (3,167,076) |
Total common stockholders’ equity | 6,748,332 | 6,653,011 |
Total liabilities and equity | 9,770,451 | 10,194,783 |
Fixed maturity securities available for sale at cost | 285,900 | 805,211 |
Financing receivable, allowance for credit loss | 559 | 647 |
Equity securities available for sale at cost | 3,430 | 3,430 |
Accumulated undistributed net income of subsidiaries | $ 7,975,360 | $ 6,463,882 |

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- Definition Accumulated Undistributed Net Income Of Subsidiaries + References No definition available. + Details
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Namespace Prefix: | wrb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |