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Schedule III - Supplementary Insurance Information (Details) - USD ($)
$ in Millions
 12 Months Ended
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.