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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, 2024
Dec. 31, 2023
Dec. 31, 2022
Condensed Financial Statements, Captions [Line Items]      
Net investment income $ 920,496 $ 734,532 $ 446,755
Change in fair value of equity securities 1,802,796 1,566,231 (1,554,750)
Net investment gains (losses) 1,807,219 1,524,054 (1,595,733)
Gain on disposition of subsidiary 0 18,965 225,832
Other 7,211 42,733 33,970
Total operating revenues 16,620,763 15,803,630 11,675,335
Services and other expenses 2,424,372 2,310,769 2,306,985
Interest expense 204,300 185,077 196,062
Net foreign exchange losses (gains) (129,438) 90,045 (137,832)
Total operating expenses 12,908,201 12,874,802 11,768,671
Income tax (expense) benefit (790,294) (552,616) 48,209
Net Income (Loss) to Shareholders 2,747,022 1,996,060 (216,277)
Preferred stock dividends (36,000) (36,000) (36,000)
Net Income (Loss) to Common Shareholders 2,711,022 1,960,060 (252,277)
Net holding gains (losses) arising during the period (148,302) 278,363 (1,199,736)
Reclassification adjustments for net gains (losses) included in net income (loss) 18,007 28,540 44,906
Change in net unrealized gains (losses) on available-for-sale investments, net of taxes (130,295) 306,903 (1,154,830)
Total Other Comprehensive Income (Loss) (138,754) 289,338 (989,485)
Comprehensive Income (Loss) to Shareholders 2,608,150 2,285,344 (1,205,779)
Parent Company [Member]      
Condensed Financial Statements, Captions [Line Items]      
Net investment income 86,583 92,080 34,781
Dividends on common stock of consolidated subsidiaries 575,008 310,000 278,557
Net realized investment gains (losses) 16,718 (515) 7,620
Change in fair value of equity securities 342,623 275,048 (397,906)
Net investment gains (losses) 359,341 274,533 (390,286)
Gain on disposition of subsidiary 0 0 107,293
Other 31,132 (28,718) (29,487)
Total operating revenues 1,052,064 647,895 858
Services and other expenses 12,061 19,716 111,848
Interest expense 179,626 156,953 172,125
Net foreign exchange losses (gains) (36,907) 9,038 (13,143)
Total operating expenses 154,780 185,707 270,830
Income (Loss) Before Equity in Undistributed Earnings (Losses) of Consolidated Subsidiaries and Income Taxes 897,284 462,188 (269,972)
Equity in undistributed earnings (losses) of consolidated subsidiaries 1,941,339 1,580,347 (72,125)
Income tax (expense) benefit (91,601) (46,475) 125,820
Net Income (Loss) to Shareholders 2,747,022 1,996,060 (216,277)
Preferred stock dividends (36,000) (36,000) (36,000)
Net Income (Loss) to Common Shareholders 2,711,022 1,960,060 (252,277)
Net holding gains (losses) arising during the period 109 1,453 (24,465)
Consolidated subsidiaries' net holding gains (losses) arising during the period (148,411) 276,910 (1,175,271)
Reclassification adjustments for net gains (losses) included in net income (loss) 365 (92) 1,965
Consolidated subsidiaries' reclassification adjustments for net losses included in net income to shareholders 17,642 28,632 42,941
Change in net unrealized gains (losses) on available-for-sale investments, net of taxes (130,295) 306,903 (1,154,830)
Consolidated Subsidiaries' Change in discount rate for life and annuity benefits, net of taxes 252 (22,343) 149,874
Consolidated subsidiaries' change in foreign currency translation adjustments, net of taxes (3,883) 4,650 (9,276)
Consolidated subsidiaries' change in net actuarial pension loss, net of taxes (4,946) 74 24,730
Total Other Comprehensive Income (Loss) (138,872) 289,284 (989,502)
Comprehensive Income (Loss) to Shareholders $ 2,608,150 $ 2,285,344 $ (1,205,779)