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Supplementary Insurance Information - Table (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items] |  |  |
Deferred policy acquisition costs | $ 320 | $ 309 | $ 288
Reserves for claims and unpaid losses and LAE | 14,179 | 13,087 | 11,974
Unearned premiums | 3,584 | 3,451 | 3,246
Net earned premiums | 7,036 | 6,531 | 6,085
Net investment income | 780 | 742 | 717
Claims, losses and settlement expenses | 4,460 | 4,033 | 3,629
Amortization of deferred policy acquisition costs | 766 | 720 | 641
Other operating expenses | 1,974 | 2,001 | 1,647
Net written premiums | 7,139 | 6,692 | 6,206
Property and casualty insurance |  |  |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items] |  |  |
Deferred policy acquisition costs | 320 | 309 | 288
Reserves for claims and unpaid losses and LAE | 14,179 | 13,087 | 11,974
Unearned premiums | 3,584 | 3,451 | 3,246
Net earned premiums | 7,036 | 6,531 | 6,085
Net investment income | 784 | 729 | 683
Claims, losses and settlement expenses | 4,455 | 4,017 | 3,629
Amortization of deferred policy acquisition costs | 766 | 720 | 641
Other operating expenses | 1,279 | 1,235 | 1,091
Net written premiums | 7,139 | 6,692 | 6,206
Other |  |  |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items] |  |  |
Net investment income | (4) | 13 | 34
Claims, losses and settlement expenses | 5 | 16 |
Other operating expenses | $ 695 | $ 766 | $ 556

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