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Income Taxes (Reconciliations Of United States Corporate Income Tax Rate To Effective Tax Rate On Income Before Income Taxes) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Income Tax Disclosure [Abstract]      
U.S. corporate tax rate 21.00% 21.00% 21.00%
State income taxes, net of U.S. federal income tax benefit, percent 1.10% 1.00% (2.20%)
Tax-exempt investment income, percent (0.40%) (0.60%) 10.60%
Foreign operations, percent 0.30% 0.40% (3.50%)
Impairment of goodwill, percent 0.00% 0.00% (11.10%)
Markel CATCo Re income not subject to tax, percent (0.30%) (0.60%) 12.50%
Other, percent 0.00% (0.40%) 4.50%
Effective tax rate 21.70% 20.80% 31.80%
Income taxes at U.S. corporate tax rate $ 763,917 $ 557,278 $ (31,829)
State income taxes, net of U.S. federal income tax benefit 39,770 27,007 3,369
Tax-exempt investment income (14,830) (15,328) (16,063)
Foreign operations 12,985 10,854 5,335
Impairment of goodwill 0 0 16,800
Markel CATCo Re income not subject to tax (12,201) (15,013) (18,871)
Other 653 (12,182) (6,950)
Income tax expense (benefit) $ 790,294 $ 552,616 $ (48,209)