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Markel Group (Parent Company Only) Financial Information (Schedule Of Condensed Statements Of Cash Flows) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Condensed Financial Statements, Captions [Line Items] |  |  |
Net income (loss) to shareholders | $ 2,747,022 | $ 1,996,060 | $ (216,277)
Net Cash Provided By Operating Activities | 2,594,006 | 2,786,807 | 2,709,442
Proceeds from sales, maturities, calls and prepayments of fixed maturity securities | 2,068,755 | 2,126,586 | 1,152,335
Cost of fixed maturity securities purchased | (3,588,989) | (4,302,864) | (2,112,066)
Proceeds from sales of equity securities | 177,254 | 298,582 | 242,010
Cost of equity securities purchased | (571,096) | (638,306) | (442,991)
Net change in short-term investments | 151,972 | 202,930 | (846,019)
Cost of equity method investments | (205,937) | (192,715) | (20,051)
Other | 32,167 | 23,081 | 28,345
Net Cash Used By Investing Activities | (2,398,618) | (2,703,607) | (1,670,204)
Repayment and retirement of senior long-term debt | (896,749) | (949,636) | (1,255,005)
Additions to senior long-term debt | 1,434,205 | 624,972 | 1,034,052
Repurchases of common stock | (572,728) | (445,479) | (290,796)
Dividends paid on preferred stock | (36,000) | (36,000) | (36,000)
Other | (8,886) | (12,227) | (32,307)
Net Cash Used By Financing Activities | (297,878) | (999,716) | (595,311)
Increase (decrease) in cash, cash equivalents, restricted cash and restricted cash equivalents | (139,786) | (889,479) | 340,566
Cash, cash equivalents, restricted cash and restricted cash equivalents at beginning of year | 4,332,034 | 5,221,513 | 4,880,947
CASH, CASH EQUIVALENTS, RESTRICTED CASH AND RESTRICTED CASH EQUIVALENTS AT END OF YEAR | 4,192,248 | 4,332,034 | 5,221,513
Parent Company [Member] |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Net income (loss) to shareholders | 2,747,022 | 1,996,060 | (216,277)
Adjustments to reconcile net income (loss) to shareholders to net cash provided by operating activities | (2,183,635) | (1,664,382) | 489,413
Net Cash Provided By Operating Activities | 563,387 | 331,678 | 273,136
Proceeds from sales, maturities, calls and prepayments of fixed maturity securities | 14,459 | 72,834 | 13,047
Cost of fixed maturity securities purchased | (6,516) | (48,501) | 0
Proceeds from sales of equity securities | 3,662 | 24,237 | 65,379
Cost of equity securities purchased | (310) | (7,731) | (16,660)
Net change in short-term investments | (315,622) | 451,846 | 58,970
Decrease (increase) in notes receivable due from subsidiaries | 0 | 0 | 75,645
Capital contributions to subsidiaries | (174,002) | (55,575) | (94,585)
Proceeds from sale of subsidiary | 0 | 16,090 | 165,615
Cost of equity method investments | 0 | (5,000) | 0
Other | 2,694 | (12,691) | 4,779
Net Cash Used By Investing Activities | (475,635) | 435,509 | 272,190
Repayment and retirement of senior long-term debt | 0 | (250,000) | (350,000)
Additions to senior long-term debt | 592,596 | 0 | 0
Decrease in notes payable to subsidiaries | 0 | 0 | (32,753)
Repurchases of common stock | (572,728) | (445,479) | (290,796)
Dividends paid on preferred stock | (36,000) | (36,000) | (36,000)
Other | (1,273) | 0 | 0
Net Cash Used By Financing Activities | (17,405) | (731,479) | (709,549)
Increase (decrease) in cash, cash equivalents, restricted cash and restricted cash equivalents | 70,347 | 35,708 | (164,223)
Cash, cash equivalents, restricted cash and restricted cash equivalents at beginning of year | 650,955 | 615,247 | 779,470
CASH, CASH EQUIVALENTS, RESTRICTED CASH AND RESTRICTED CASH EQUIVALENTS AT END OF YEAR | 721,302 | 650,955 | 615,247
Cash dividends received from subsidiaries, Parent Company | 575,000 | 310,000 | 245,102
Noncash Capital Distribution to Subsidiaries, Parent Company | $ 0 | $ 43,111 | $ 923,980

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- Definition Amount of cash outflow to acquire investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 11 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481830/320-10-45-11 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-13 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 11 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-11 + Details
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- Definition The cash outflow associated with the purchase of or advances to an equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-13 + Details
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- Definition Amount of cash outflow to acquire investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI), classified as investing activity. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 19 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-19 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 45 -Paragraph 1 -SubTopic 10 -Topic 321 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479567/321-10-45-1 + Details
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- Definition The cash inflow associated with the amount received from the sale of a portion of the company's business, for example a segment, division, branch or other business, during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-12 + Details
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- Definition The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 14 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-14 + Details
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- Definition Amount of cash inflow (outflow) from financing activities classified as other. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 14 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-14 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name Accounting Standards Codification -Section 45 -Paragraph 15 -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-15 + Details
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- Definition Amount of cash inflow from sale, maturity, prepayment and call of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 11 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481830/320-10-45-11 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 11 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-11 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 12 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-12 + Details
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- Definition Amount of cash outflow for short-term and long-term debt. Excludes payment of lease obligation. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 15 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-15 + Details
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