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Schedule III - Supplementary Insurance Information (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Supplementary Insurance Information, by Segment [Line Items]      
Deferred Acquisition Costs $ 962 $ 872 $ 622
Reverse for Losses and Loss Adjustment Expenses 22,065 19,009 16,399
Unearned Premium Reserves 5,147 4,610 3,501
Premiums Earned 11,787 10,406 8,682
Net Investment Income 830 1,165 642
Incurred Loss and Loss Adjustment Expenses 8,100 7,391 6,551
Amortization of Deferred Acquisition Costs 2,528 2,209 1,873
Other Operating Expenses 682 583 511
Net Written Premium 12,344 11,446 9,117
Reinsurance [Member]      
Supplementary Insurance Information, by Segment [Line Items]      
Deferred Acquisition Costs 710 654 448
Reverse for Losses and Loss Adjustment Expenses 16,140 13,895 12,023
Unearned Premium Reserves 2,894 2,723 1,995
Premiums Earned 8,663 7,757 6,466
Net Investment Income 590 823 458
Incurred Loss and Loss Adjustment Expenses 5,997 5,556 4,933
Amortization of Deferred Acquisition Costs 2,134 1,854 1,552
Other Operating Expenses 218 199 176
Net Written Premium 8,983 8,536 6,768
Insurance [Member]      
Supplementary Insurance Information, by Segment [Line Items]      
Deferred Acquisition Costs 252 218 174
Reverse for Losses and Loss Adjustment Expenses 5,925 5,114 4,376
Unearned Premium Reserves 2,253 1,887 1,506
Premiums Earned 3,124 2,649 2,215
Net Investment Income 240 342 184
Incurred Loss and Loss Adjustment Expenses 2,103 1,835 1,617
Amortization of Deferred Acquisition Costs 394 354 321
Other Operating Expenses 463 383 336
Net Written Premium $ 3,361 $ 2,910 $ 2,349