| Dec 31,
2010 | Dec 31,
2012 | Dec 31,
2013 | Dec 31,
2014 | Dec 31,
2015 | Dec 31,
2016 | Dec 31,
2017 | Dec 31,
2018 | Dec 31,
2019 | Dec 31,
2020 | Dec 31,
2021 | Dec 31,
2022 | Dec 31,
2023 | Dec 31,
2024 |
|---|
| Net income (loss) | 268 | 258 | 284 | 324 | 589 | 460 | 401 | -130 | 1,799 | 832 | 2,448 | -101 | 2,101 | 2,847 |
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| Deferred income tax expense (benefit) | - | -38 | -4 | -85 | 10 | -63 | 324 | -3 | -323 | 3 | -454 | 282 | -234 | -395 |
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| Depreciation and amortization expense | 54 | 87 | 190 | 204 | 201 | 194 | 204 | 228 | 269 | 307 | 336 | 367 | 260 | 342 |
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| Net amortization of investment premium or discount | - | - | - | - | - | - | - | - | - | - | - | - | - | 124 |
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| Net investment losses (gains) | 36 | 32 | 63 | 46 | 106 | 65 | -5 | -438 | 1,602 | 618 | 1,979 | -1,596 | 1,524 | 1,807 |
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| Net foreign exchange losses (gains) | - | - | - | - | - | - | - | 107 | -2 | -96 | 72 | 140 | -90 | 129 |
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| Gain on sale of businesses, net | - | - | - | - | - | - | - | - | - | - | - | 226 | 19 | - |
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| Increase in receivables | - | 37 | -142 | -21 | -6 | 163 | 38 | 28 | 104 | 28 | 372 | 653 | 486 | 159 |
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| Increase in reinsurance recoverables | - | - | - | - | - | - | - | - | - | 550 | 1,312 | 1,168 | 768 | 2,387 |
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| Decrease (increase) in deferred policy acquisition costs | 14 | -37 | 104 | 99 | 7 | 42 | 68 | 16 | 93 | 62 | 140 | 141 | 2 | -50 |
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| Increase in prepaid reinsurance premiums | - | - | - | - | - | - | - | - | - | 34 | 348 | 271 | 298 | 584 |
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| Increase in unpaid losses and loss adjustment expenses | - | - | - | - | -92 | -9 | 619 | 299 | 226 | 1,383 | 2,042 | 2,383 | 2,443 | 3,251 |
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| Decrease in life and annuity benefits | - | - | -40 | -63 | -85 | -55 | -56 | -51 | -52 | -45 | -55 | -47 | -48 | -39 |
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| Increase in unearned premiums | 38 | 71 | 97 | 148 | -5 | 135 | 198 | 63 | 354 | 355 | 970 | 886 | 400 | 448 |
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| Increase (Decrease) in Reinsurance Payables | 1 | 19 | -151 | -45 | -32 | 12 | -41 | -4 | 65 | 77 | 132 | 211 | 365 | 398 |
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| Other | -8 | 22 | -14 | 14 | -67 | 1 | -21 | 25 | -33 | -98 | -145 | -216 | -38 | -91 |
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| Net Cash Provided By Operating Activities | 223 | 393 | 746 | 717 | 651 | 535 | 859 | 893 | 1,274 | 1,738 | 2,274 | 2,709 | 2,787 | 2,594 |
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| Proceeds from Sale and Maturity of Debt Securities, Available-for-Sale | - | - | - | - | - | - | - | - | - | - | - | 1,152 | 2,127 | 2,069 |
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| Cost of fixed maturity securities purchased | - | - | - | - | - | - | - | - | - | - | - | 2,112 | 4,303 | 3,589 |
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| Proceeds from sales of equity securities | - | - | - | - | - | - | - | - | - | - | - | 242 | 299 | 177 |
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| Cost of equity securities purchased | - | - | - | - | - | - | - | - | - | - | - | 443 | 638 | 571 |
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| Net change in short-term investments | -203 | 428 | 470 | 129 | 62 | 689 | -235 | -1,102 | 96 | 829 | -229 | 846 | -203 | -152 |
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| Cost of other investments purchased | - | 41 | 38 | 16 | 22 | 9 | 13 | - | 258 | 5 | 42 | - | 193 | 206 |
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| Additions to property and equipment | 42 | 46 | 48 | 82 | 80 | 64 | 75 | 107 | 123 | 101 | 145 | 255 | 259 | 255 |
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| Acquisitions, net of cash acquired | 214 | 244 | 12 | 319 | 262 | 8 | 1,432 | 1,175 | 245 | 554 | 517 | 79 | 4 | 208 |
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| Consolidation of Markel CATCo Re, net | - | - | - | - | - | - | - | - | - | - | - | 630 | - | - |
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| Distributions to Markel CATCo Re noncontrolling interests for buy-out transaction | - | - | - | - | - | - | - | - | - | - | - | 169 | - | - |
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| Proceeds from sale of businesses, net | - | - | - | - | - | - | - | - | - | - | - | 201 | 41 | - |
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| Other | -3 | 2 | -1 | 2 | 1 | 1 | -6 | 42 | -17 | -78 | -50 | 8 | -23 | -32 |
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| Net Cash Used By Investing Activities | -283 | -339 | 187 | -622 | 126 | -1,545 | -744 | -797 | -535 | -512 | -2,938 | -1,670 | -2,704 | -2,399 |
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| Proceeds from Issuance of Debt | - | 493 | 547 | 89 | 70 | 559 | 665 | 207 | 1,645 | 223 | 1,199 | 1,034 | 625 | 1,434 |
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| Repayment of senior long-term debt and other debt | - | - | - | - | - | - | - | - | 1,104 | 276 | 487 | 1,255 | 950 | 897 |
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| Repurchases of common stock | 45 | 17 | 57 | 26 | 31 | 51 | 111 | 54 | 116 | 27 | 207 | 291 | 445 | 573 |
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| Dividends paid on preferred stock | - | - | - | - | - | - | - | - | - | 18 | 36 | 36 | 36 | 36 |
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| Purchase of noncontrolling interests | - | - | - | - | - | - | - | - | - | - | - | - | 63 | 46 |
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| Distributions to noncontrolling interests | - | - | - | - | - | - | - | - | - | - | - | - | - | -54 |
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| Redemption of Markel CATCo Re noncontrolling interests | - | 8 | 5 | 5 | 6 | 6 | 8 | 9 | 9 | - | - | - | 89 | 117 |
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| Other | -10 | -10 | -0 | -21 | -10 | -15 | -7 | -4 | -6 | -59 | -99 | -48 | -41 | -9 |
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| Net Cash Used By Financing Activities | -46 | 142 | 175 | -67 | -74 | 152 | 256 | -179 | 359 | 435 | 370 | -595 | -1,000 | -298 |
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| Effect of foreign currency rate changes on cash, cash equivalents, restricted cash and restricted cash equivalents | - | - | - | - | - | - | 45 | -21 | 6 | 56 | -42 | -103 | 27 | -37 |
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| Increase (decrease) in cash, cash equivalents, restricted cash and restricted cash equivalents | - | - | - | - | - | - | 416 | -104 | 1,104 | 1,716 | -336 | 341 | -889 | -140 |
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