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Markel Group (Parent Company Only) Financial Information (Schedule Of Condensed Balance Sheets) (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
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Condensed Financial Statements, Captions [Line Items] |  |
Fixed maturity securities, available-for-sale (amortized cost of $139,766 in 2023 and $164,100 in 2022) | $ 14,372,732 | $ 11,856,835
Equity securities (cost of $1,089,332 in 2023 and $1,107,796 in 2022) | 9,577,871 | 7,671,912
Short-term investments, available-for-sale (estimated fair value approximates cost) | 2,571,382 | 2,669,262
Investments | 26,521,985 | 22,198,009
Cash and cash equivalents | 3,747,060 | 4,137,432
Restricted cash and cash equivalents | 584,974 | 1,084,081
Other assets | 3,990,864 | 3,586,037
Total Assets | 55,045,710 | 49,791,259
Senior long-term debt | 3,779,796 | 4,103,629
Deferred tax liability, net | 1,170,399 | 859,559
Other liabilities | 3,927,498 | 3,461,482
Total Liabilities | 39,519,817 | 36,054,220
Preferred stock | 591,891 | 591,891
Common stock | 3,517,146 | 3,493,893
Retained earnings | 11,353,101 | 9,832,804
Accumulated other comprehensive loss | (478,210) | (767,494)
Shareholders' equity | 14,983,928 | 13,151,094
Total Liabilities and Equity | 55,045,710 | 49,791,259
Parent Company [Member] |  |
Condensed Financial Statements, Captions [Line Items] |  |
Fixed maturity securities, available-for-sale (amortized cost of $139,766 in 2023 and $164,100 in 2022) | 131,544 | 154,039
Equity securities (cost of $1,089,332 in 2023 and $1,107,796 in 2022) | 1,731,839 | 1,473,116
Short-term investments, available-for-sale (estimated fair value approximates cost) | 1,032,118 | 1,436,387
Investments | 2,895,501 | 3,063,542
Cash and cash equivalents | 635,047 | 594,101
Restricted cash and cash equivalents | 15,908 | 21,146
Investments in consolidated subsidiaries | 14,928,756 | 12,990,913
Notes receivable from subsidiaries | 0 | 60,111
Other assets | 441,977 | 458,945
Total Assets | 18,917,189 | 17,188,758
Senior long-term debt | 3,439,197 | 3,686,892
Income taxes payable | 213,770 | 120,616
Deferred tax liability, net | 201,140 | 148,365
Other liabilities | 79,154 | 81,791
Total Liabilities | 3,933,261 | 4,037,664
Preferred stock | 591,891 | 591,891
Common stock | 3,517,146 | 3,493,893
Retained earnings | 11,353,101 | 9,832,804
Accumulated other comprehensive loss | (478,210) | (767,494)
Shareholders' equity | 14,983,928 | 13,151,094
Total Liabilities and Equity | $ 18,917,189 | $ 17,188,758

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