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Markel Group (Parent Company Only) Financial Information (Schedule Of Condensed Balance Sheets) (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Condensed Financial Statements, Captions [Line Items] |  |
Fixed maturity securities, available-for-sale (amortized cost of $130,983 in 2024 and $139,766 in 2023) | $ 15,745,539 | $ 14,372,732
Equity securities (cost of $1,084,814 in 2024 and $1,089,332 in 2023) | 11,784,521 | 9,577,871
Short-term investments, available-for-sale (estimated fair value approximates cost) | 2,524,910 | 2,571,382
Investments | 30,054,970 | 26,521,985
Cash and cash equivalents | 3,692,667 | 3,747,060
Restricted cash and cash equivalents | 499,581 | 584,974
Other assets | 4,400,711 | 3,990,864
Total Assets | 61,897,982 | 55,045,710
Senior long-term debt | 4,330,341 | 3,779,796
Deferred tax liability, net | 1,541,030 | 1,170,399
Other liabilities | 4,383,444 | 3,927,498
Total Liabilities | 44,429,009 | 39,519,817
Preferred stock | 591,891 | 591,891
Common stock | 3,560,633 | 3,517,146
Retained earnings | 13,380,456 | 11,353,101
Accumulated other comprehensive loss | (617,082) | (478,210)
Shareholders' equity | 16,915,898 | 14,983,928
Total Liabilities and Equity | 61,897,982 | 55,045,710
Parent Company [Member] |  |
Condensed Financial Statements, Captions [Line Items] |  |
Fixed maturity securities, available-for-sale (amortized cost of $130,983 in 2024 and $139,766 in 2023) | 123,053 | 131,544
Equity securities (cost of $1,084,814 in 2024 and $1,089,332 in 2023) | 2,071,110 | 1,731,839
Short-term investments, available-for-sale (estimated fair value approximates cost) | 1,410,830 | 1,032,118
Investments | 3,604,993 | 2,895,501
Cash and cash equivalents | 701,289 | 635,047
Restricted cash and cash equivalents | 20,013 | 15,908
Investments in consolidated subsidiaries | 16,699,125 | 14,928,756
Other assets | 450,327 | 441,977
Total Assets | 21,475,747 | 18,917,189
Senior long-term debt | 4,032,960 | 3,439,197
Income taxes payable | 179,381 | 213,770
Deferred tax liability, net | 274,661 | 201,140
Other liabilities | 72,847 | 79,154
Total Liabilities | 4,559,849 | 3,933,261
Preferred stock | 591,891 | 591,891
Common stock | 3,560,633 | 3,517,146
Retained earnings | 13,380,456 | 11,353,101
Accumulated other comprehensive loss | (617,082) | (478,210)
Shareholders' equity | 16,915,898 | 14,983,928
Total Liabilities and Equity | $ 21,475,747 | $ 18,917,189

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