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Schedule III - Supplementary Insurance Information (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items]      
Deferred Acquisition Costs $ 1,717 $ 1,734 $ 1,531
Reserves for Losses and Loss Adjustment Expenses 33,547 29,369 22,752
Unearned Premiums 10,100 10,218 8,808
Net Premiums Earned 17,065 15,100 12,440
Net Losses and Loss Adjustment Expenses Incurred 9,370 8,342 6,246
Amortization of Deferred Acquisition Costs 3,153 2,651 2,312
Other Operating Expenses [1] 1,826 1,472 1,301
Net Premiums Written 16,476 15,732 13,468
Operating segments | Insurance      
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items]      
Deferred Acquisition Costs 788 696 566
Reserves for Losses and Loss Adjustment Expenses 17,527 16,277 12,250
Unearned Premiums 5,199 4,857 3,917
Net Premiums Earned 7,771 6,627 5,446
Net Losses and Loss Adjustment Expenses Incurred 4,764 4,070 3,122
Amortization of Deferred Acquisition Costs 1,496 1,217 1,055
Other Operating Expenses [1] 1,172 995 819
Net Premiums Written 7,798 6,874 5,862
Operating segments | Reinsurance      
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items]      
Deferred Acquisition Costs 872 981 901
Reserves for Losses and Loss Adjustment Expenses 15,523 12,567 9,924
Unearned Premiums 4,545 4,891 4,254
Net Premiums Earned 8,122 7,242 5,836
Net Losses and Loss Adjustment Expenses Incurred 4,610 4,327 3,227
Amortization of Deferred Acquisition Costs 1,644 1,432 1,240
Other Operating Expenses [1] 469 270 288
Net Premiums Written 7,618 7,746 6,554
Operating segments | Mortgage      
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items]      
Deferred Acquisition Costs 57 57 64
Reserves for Losses and Loss Adjustment Expenses 497 525 578
Unearned Premiums 356 470 637
Net Premiums Earned 1,172 1,231 1,158
Net Losses and Loss Adjustment Expenses Incurred (4) (55) (103)
Amortization of Deferred Acquisition Costs 13 2 17
Other Operating Expenses [1] 185 207 194
Net Premiums Written $ 1,060 $ 1,112 $ 1,052
[1] Certain other operating expenses relate to the Company’s corporate items. Such amounts are not reflected in the table above. See note 4, “Segment Information,” to our consolidated financial statements in Item 8 for information