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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 $ 1,247 $ 962 $ 872
Reserve for Losses and Loss Adjustment Expenses 24,604 22,065 19,009
Unearned Premium Reserves 6,622 5,147 4,610
Premiums Earned 13,443 11,787 10,406
Net Investment Income 1,434 830 1,165
Incurred Loss and Loss Adjustment Expenses 8,427 8,100 7,391
Amortization of Deferred Acquisition Costs 2,952 2,528 2,209
Other Operating Expenses 846 682 583
Net Written Premium 14,730 12,344 11,446
Reinsurance      
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items]      
Deferred Acquisition Costs 968 710 654
Reserve for Losses and Loss Adjustment Expenses 17,659 16,111 13,872
Unearned Premium Reserves 4,018 2,894 2,723
Premiums Earned 9,799 8,598 7,708
Net Investment Income 1,004 590 823
Incurred Loss and Loss Adjustment Expenses 5,696 5,966 5,543
Amortization of Deferred Acquisition Costs 2,520 2,116 1,833
Other Operating Expenses 255 217 198
Net Written Premium 10,802 8,919 8,488
Insurance      
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items]      
Deferred Acquisition Costs 279 252 218
Reserve for Losses and Loss Adjustment Expenses 6,945 5,954 5,137
Unearned Premium Reserves 2,605 2,253 1,887
Premiums Earned 3,644 3,189 2,698
Net Investment Income 429 240 342
Incurred Loss and Loss Adjustment Expenses 2,732 2,134 1,848
Amortization of Deferred Acquisition Costs 432 413 376
Other Operating Expenses 591 464 385
Net Written Premium $ 3,929 $ 3,426 $ 2,958