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Schedule III - Supplementary Insurance Information (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items] |  |  |  |  |
Deferred Acquisition Costs |  | $ 1,531 | $ 1,263 | $ 901 |
Reserves for Losses and Loss Adjustment Expenses |  | 22,752 | 20,032 | 17,758 |
Unearned Premiums |  | 8,808 | 7,337 | 6,012 |
Net Premiums Earned |  | 12,440 | 9,679 | 8,082 |
Net Losses and Loss Adjustment Expenses Incurred |  | 6,246 | 5,028 | 4,585 |
Amortization of Deferred Acquisition Costs |  | 2,312 | 1,740 | 1,303 |
Other Operating Expenses | [1] | 1,301 | 1,128 | 999 |
Net Premiums Written |  | 13,468 | 11,078 | 9,017 |
Operating segments | Insurance |  |  |  |  |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items] |  |  |  |  |
Deferred Acquisition Costs |  | 566 | 301 | 378 |
Reserves for Losses and Loss Adjustment Expenses |  | 12,250 | 11,017 | 9,811 |
Unearned Premiums |  | 3,917 | 3,382 | 2,938 |
Net Premiums Earned |  | 5,446 | 4,560 | 3,625 |
Net Losses and Loss Adjustment Expenses Incurred |  | 3,122 | 2,784 | 2,345 |
Amortization of Deferred Acquisition Costs |  | 1,055 | 887 | 606 |
Other Operating Expenses | [1] | 819 | 665 | 559 |
Net Premiums Written |  | 5,862 | 5,021 | 4,149 |
Operating segments | Reinsurance |  |  |  |  |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items] |  |  |  |  |
Deferred Acquisition Costs |  | 901 | 992 | 424 |
Reserves for Losses and Loss Adjustment Expenses |  | 9,924 | 8,306 | 6,879 |
Unearned Premiums |  | 4,254 | 3,206 | 2,263 |
Net Premiums Earned |  | 5,836 | 3,959 | 2,841 |
Net Losses and Loss Adjustment Expenses Incurred |  | 3,227 | 2,568 | 1,925 |
Amortization of Deferred Acquisition Costs |  | 1,240 | 813 | 537 |
Other Operating Expenses | [1] | 288 | 268 | 214 |
Net Premiums Written |  | 6,554 | 4,924 | 3,254 |
Operating segments | Mortgage |  |  |  |  |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items] |  |  |  |  |
Deferred Acquisition Costs |  | 64 | (30) | 99 |
Reserves for Losses and Loss Adjustment Expenses |  | 578 | 709 | 1,068 |
Unearned Premiums |  | 637 | 749 | 811 |
Net Premiums Earned |  | 1,158 | 1,160 | 1,283 |
Net Losses and Loss Adjustment Expenses Incurred |  | (103) | (324) | 57 |
Amortization of Deferred Acquisition Costs |  | 17 | 40 | 97 |
Other Operating Expenses | [1] | 194 | 195 | 193 |
Net Premiums Written |  | 1,052 | 1,133 | 1,261 |
Operating segments | Other |  |  |  |  |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items] |  |  |  |  |
Deferred Acquisition Costs |  |  |  |  |
Reserves for Losses and Loss Adjustment Expenses |  |  |  |  |
Unearned Premiums |  |  |  |  |
Net Premiums Earned |  |  |  | 333 |
Net Losses and Loss Adjustment Expenses Incurred |  |  |  | 258 |
Amortization of Deferred Acquisition Costs |  |  |  | 63 |
Other Operating Expenses |  |  |  | 33 | [1]
Net Premiums Written |  |  |  | $ 353 |
[1] | Certain other operating expenses relate to the Company’s corporate segment. Such amounts are not reflected in the table above. See note 4, “Segment Information,” to our consolidated financial statements in Item 8 for information related to the corporate segment.

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