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Investment Information - Net investment income (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Net investment income: |  |  |  |  |
Gross investment income |  | $ 386 | $ 260 | $ 736 | $ 479
Investment expenses |  | (22) | (18) | (45) | (38)
Net investment income |  | 364 | 242 | 691 | 441
Fixed maturities |  |  |  |  |
Net investment income: |  |  |  |  |
Gross investment income |  | 306 | 214 | 586 | 402
Short-term investments |  |  |  |  |
Net investment income: |  |  |  |  |
Gross investment income |  | 35 | 15 | 64 | 29
Equity securities |  |  |  |  |
Net investment income: |  |  |  |  |
Gross investment income |  | 10 | 6 | 18 | 10
Other |  |  |  |  |
Net investment income: |  |  |  |  |
Gross investment income | [1] | $ 35 | $ 25 | $ 68 | $ 38
[1] | Amounts include dividends and other distributions on investment funds, term loan investments, funds held balances, cash balances and other items.

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