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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

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