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Investment Information - Net investment Income (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Net investment income: |  |  |  |
Gross investment income |  | $ 1,100 | $ 567 | $ 478
Investment expenses |  | (77) | (71) | (89)
Net investment income |  | 1,023 | 496 | 389
Fixed maturities available for sale, at fair value (amortized cost: $24,131 and $21,282; net of allowance for credit losses: $28 and $41) |  |  |  |
Net investment income: |  |  |  |
Gross investment income |  | 917 | 469 | 331
Short-term investments |  |  |  |
Net investment income: |  |  |  |
Gross investment income |  | 68 | 29 | 7
Equity securities |  |  |  |
Net investment income: |  |  |  |
Gross investment income |  | 22 | 22 | 42
Term loan investments |  |  |  |
Net investment income: |  |  |  |
Gross investment income |  | 0 | 0 | 30
Other |  |  |  |
Net investment income: |  |  |  |
Gross investment income | [1] | $ 93 | $ 47 | $ 68
[1] | Includes interest income on operating cash, distributions from investment funds and other items.

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