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Markel Group (Parent Company Only) Financial Information (Schedule Of Condensed Statements Of Income And Comprehensive Income) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Condensed Financial Statements, Captions [Line Items]      
Net investment income $ 734,532 $ 446,755 $ 367,417
Change in fair value of equity securities 1,566,231 (1,554,750) 1,940,626
Net investment gains (losses) 1,524,054 (1,595,733) 1,978,534
Gain on disposition of subsidiary 18,965 225,832 22,085
Other 42,733 33,970 33,727
Total operating revenues 15,803,630 11,675,335 12,846,425
Services and other expenses 2,310,769 2,306,985 2,024,931
Interest expense 185,077 196,062 183,579
Net foreign exchange losses (gains) 90,045 (137,832) (71,902)
Total operating expenses 12,874,802 11,768,671 9,604,920
Income tax (expense) benefit (552,616) 48,209 (683,961)
Net Income (Loss) to Shareholders 1,996,060 (216,277) 2,423,135
Preferred stock dividends (36,000) (36,000) (36,000)
Net Income (Loss) to Common Shareholders 1,960,060 (252,277) 2,387,135
Net holding gains (losses) arising during the period 278,363 (1,199,736) (398,076)
Reclassification adjustments for net gains (losses) included in net income (loss) 28,540 44,906 (6,623)
Change in net unrealized gains (losses) on available-for-sale investments, net of taxes 306,903 (1,154,830) (404,699)
Total Other Comprehensive Income (Loss) 289,338 (989,485) (347,111)
Comprehensive Income (Loss) to Shareholders 2,285,344 (1,205,779) 2,076,026
Parent Company [Member]      
Condensed Financial Statements, Captions [Line Items]      
Net investment income 92,080 34,781 9,099
Dividends on common stock of consolidated subsidiaries 310,000 278,557 1,081,988
Net realized investment gains (losses) (515) 7,620 23,652
Change in fair value of equity securities 275,048 (397,906) 514,727
Net investment gains (losses) 274,533 (390,286) 538,379
Gain on disposition of subsidiary 0 107,293 0
Other (28,718) (29,487) 11,078
Total operating revenues 647,895 858 1,640,544
Services and other expenses 19,716 111,848 22,379
Interest expense 156,953 172,125 185,568
Net foreign exchange losses (gains) 9,038 (13,143) (6,236)
Total operating expenses 185,707 270,830 201,711
Income (Loss) Before Equity in Undistributed Earnings (Losses) of Consolidated Subsidiaries and Income Taxes 462,188 (269,972) 1,438,833
Equity in undistributed earnings (losses) of consolidated subsidiaries 1,580,347 (72,125) 1,080,108
Income tax (expense) benefit (46,475) 125,820 (95,806)
Net Income (Loss) to Shareholders 1,996,060 (216,277) 2,423,135
Preferred stock dividends (36,000) (36,000) (36,000)
Net Income (Loss) to Common Shareholders 1,960,060 (252,277) 2,387,135
Net holding gains (losses) arising during the period 1,453 (24,465) (5,885)
Consolidated subsidiaries' net holding gains (losses) arising during the period 276,910 (1,175,271) (392,191)
Reclassification adjustments for net gains (losses) included in net income (loss) (92) 1,965 (34)
Consolidated subsidiaries' reclassification adjustments for net gains (losses) included in net income (loss) to shareholders 28,632 42,941 (6,589)
Change in net unrealized gains (losses) on available-for-sale investments, net of taxes 306,903 (1,154,830) (404,699)
Consolidated Subsidiaries' Change in discount rate for life and annuity benefits, net of taxes (22,343) 149,874 49,411
Consolidated subsidiaries' change in foreign currency translation adjustments, net of taxes 4,650 (9,276) (211)
Consolidated subsidiaries' change in net actuarial pension loss, net of taxes 74 24,730 8,390
Total Other Comprehensive Income (Loss) 289,284 (989,502) (347,109)
Comprehensive Income (Loss) to Shareholders $ 2,285,344 $ (1,205,779) $ 2,076,026