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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