Investment Information - Net investment income (Details) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||||
|---|---|---|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
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| Net investment income: | ||||||
| Gross investment income | $ 442 | $ 429 | $ 879 | $ 836 | ||
| Investment expenses | (25) | (24) | (54) | (53) | ||
| Net investment income | 417 | 405 | 825 | 783 | ||
| Fixed maturities | ||||||
| Net investment income: | ||||||
| Gross investment income | 386 | 360 | 770 | 702 | ||
| Short-term investments | ||||||
| Net investment income: | ||||||
| Gross investment income | 26 | 24 | 50 | 50 | ||
| Equity securities | ||||||
| Net investment income: | ||||||
| Gross investment income | 9 | 10 | 17 | 21 | ||
| Other | ||||||
| Net investment income: | ||||||
| Gross investment income | [1] | $ 21 | $ 35 | $ 42 | $ 63 | |
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