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Markel Group (Parent Company Only) Financial Information (Schedule of Condensed Balance Sheets - Parenthetical) (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
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Condensed Financial Statements, Captions [Line Items] |  |
Fixed maturities, amortized cost | $ 14,932,286 | $ 12,805,887
Equity securities cost | 3,497,071 | 3,100,040
Parent Company [Member] |  |
Condensed Financial Statements, Captions [Line Items] |  |
Fixed maturities, amortized cost | 139,766 | 164,100
Equity securities cost | $ 1,089,332 | $ 1,107,796

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