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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

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