Investments - Net Investment Income (Details) - USD ($) $ in Millions |
3 Months Ended | |
|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
|
| Schedule of Investment Income, Reported Amounts, by Category [Line Items] | ||
| Gross investment income | $ 603 | $ 553 |
| Investment expenses | (13) | (12) |
| Net investment income (excluding net realized capital losses) | 590 | 541 |
| Net realized capital losses | (16) | (21) |
| Net investment income | 574 | 520 |
| Debt securities: | ||
| Schedule of Investment Income, Reported Amounts, by Category [Line Items] | ||
| Gross investment income | 351 | 323 |
| Mortgage loans | ||
| Schedule of Investment Income, Reported Amounts, by Category [Line Items] | ||
| Gross investment income | 22 | 21 |
| Other investments | ||
| Schedule of Investment Income, Reported Amounts, by Category [Line Items] | ||
| Gross investment income | $ 230 | $ 209 |