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Products, Services and Other Revenues (Schedule Of Revenues From Contracts With Customers By Type) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Disaggregation of Revenue [Line Items] |  |  |  |
Other revenues | $ 1,457,173 | $ 1,416,951 | $ 2,600,960 | $ 2,529,512
Income (loss) from equity method investments | (7,100) | (4,200) | (8,700) | (27,400)
Revenue from contracts with customers [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other revenues | 1,362,413 | 1,354,917 | 2,427,283 | 2,302,802
Products [Member] | Revenue from contracts with customers [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other revenues | 770,171 | 764,543 | 1,336,066 | 1,233,999
Services [Member] | Revenue from contracts with customers [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other revenues | 570,797 | 570,046 | 1,059,313 | 1,029,247
Investment management [Member] | Revenue from contracts with customers [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other revenues | 21,445 | 20,328 | 31,904 | 39,556
Program services and other fronting [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other revenues | 37,563 | 29,731 | 66,453 | 63,063
Disposition gain |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other revenues | 16,923 | 0 | 16,923 | 107,293
Equity method investments income (loss) [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Income (loss) from equity method investments | (7,149) | (4,222) | (8,667) | (27,410)
Other [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other revenues | 47,423 | 36,525 | 98,968 | 83,764
Markel Ventures [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other revenues | 1,385,813 | 1,361,298 | 2,489,752 | 2,311,683
Markel Ventures [Member] | Revenue from contracts with customers [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other revenues | 1,339,184 | 1,326,139 | 2,390,741 | 2,233,228
Markel Ventures [Member] | Products [Member] | Revenue from contracts with customers [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other revenues | 770,171 | 764,543 | 1,336,066 | 1,233,999
Markel Ventures [Member] | Services [Member] | Revenue from contracts with customers [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other revenues | 569,013 | 561,596 | 1,054,675 | 999,229
Markel Ventures [Member] | Investment management [Member] | Revenue from contracts with customers [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other revenues | 0 | 0 | 0 | 0
Markel Ventures [Member] | Program services and other fronting [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other revenues | 0 | 0 | 0 | 0
Markel Ventures [Member] | Disposition gain |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other revenues | 0 | 0 | 0 | 0
Markel Ventures [Member] | Equity method investments income (loss) [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Income (loss) from equity method investments | (387) | (975) | 1,108 | 2,083
Markel Ventures [Member] | Other [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other revenues | 47,016 | 36,134 | 97,903 | 76,372
Other [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other revenues | 71,360 | 55,653 | 111,208 | 217,829
Other [Member] | Revenue from contracts with customers [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other revenues | 23,229 | 28,778 | 36,542 | 69,574
Other [Member] | Products [Member] | Revenue from contracts with customers [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other revenues | 0 | 0 | 0 | 0
Other [Member] | Services [Member] | Revenue from contracts with customers [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other revenues | 1,784 | 8,450 | 4,638 | 30,018
Other [Member] | Investment management [Member] | Revenue from contracts with customers [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other revenues | 21,445 | 20,328 | 31,904 | 39,556
Other [Member] | Program services and other fronting [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other revenues | 37,563 | 29,731 | 66,453 | 63,063
Other [Member] | Disposition gain |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other revenues | 16,923 | 0 | 16,923 | 107,293
Other [Member] | Equity method investments income (loss) [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Income (loss) from equity method investments | (6,762) | (3,247) | (9,775) | (29,493)
Other [Member] | Other [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other revenues | $ 407 | $ 391 | $ 1,065 | $ 7,392

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