Investments - 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 |
|
| Schedule of Investment Income, Reported Amounts, by Category [Line Items] | ||||
| Gross investment income | $ 666 | $ 525 | $ 1,269 | $ 1,078 |
| Investment expenses | (12) | (11) | (25) | (23) |
| Net investment income (excluding net realized capital losses) | 654 | 514 | 1,244 | 1,055 |
| Net realized capital losses | (13) | (27) | (29) | (48) |
| Net investment income | 641 | 487 | 1,215 | 1,007 |
| Debt securities: | ||||
| Schedule of Investment Income, Reported Amounts, by Category [Line Items] | ||||
| Gross investment income | 359 | 324 | 710 | 647 |
| Mortgage loans | ||||
| Schedule of Investment Income, Reported Amounts, by Category [Line Items] | ||||
| Gross investment income | 22 | 21 | 44 | 42 |
| Other investments | ||||
| Schedule of Investment Income, Reported Amounts, by Category [Line Items] | ||||
| Gross investment income | $ 285 | $ 180 | $ 515 | $ 389 |