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Supplementary Insurance Information - Table (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 policy acquisition costs | $ 309 | $ 288 | $ 267
Reserves for claims and unpaid losses and LAE | 13,087 | 11,974 | 11,074
Unearned premiums | 3,451 | 3,246 | 3,041
Net earned premiums | 6,531 | 6,085 | 5,404
Net investment income | 742 | 717 | 730
Claims, losses and settlement expenses | 4,033 | 3,629 | 3,157
Amortization of deferred policy acquisition costs | 720 | 641 | 580
Other operating expenses | 2,001 | 1,647 | 1,480
Net written premiums | 6,692 | 6,206 | 5,573
Property and casualty insurance |  |  |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items] |  |  |
Deferred policy acquisition costs | 309 | 288 | 267
Reserves for claims and unpaid losses and LAE | 13,087 | 11,974 | 11,074
Unearned premiums | 3,451 | 3,246 | 3,041
Net earned premiums | 6,531 | 6,085 | 5,404
Net investment income | 729 | 683 | 663
Claims, losses and settlement expenses | 4,017 | 3,629 | 3,157
Amortization of deferred policy acquisition costs | 720 | 641 | 580
Other operating expenses | 1,235 | 1,091 | 967
Net written premiums | 6,692 | 6,206 | 5,573
Other |  |  |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items] |  |  |
Net investment income | 13 | 34 | 67
Claims, losses and settlement expenses | 16 |  |
Other operating expenses | $ 766 | $ 556 | $ 513

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