Investments - Net Investment Income (Details) - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2024 |
Dec. 31, 2023 |
Dec. 31, 2022 |
|
| Schedule of Investment Income, Reported Amounts, by Category [Line Items] | |||
| Gross investment income | $ 2,099 | $ 1,696 | $ 1,201 |
| Investment expenses | (63) | (46) | (43) |
| Net investment income (excluding net realized capital gains or losses) | 2,036 | 1,650 | 1,158 |
| Less: Net realized capital gains (losses) | 117 | (497) | (320) |
| Net investment income | 2,153 | 1,153 | 838 |
| Debt securities | |||
| Schedule of Investment Income, Reported Amounts, by Category [Line Items] | |||
| Gross investment income | 1,136 | 841 | 702 |
| Mortgage loans | |||
| Schedule of Investment Income, Reported Amounts, by Category [Line Items] | |||
| Gross investment income | 76 | 59 | 51 |
| Other investments | |||
| Schedule of Investment Income, Reported Amounts, by Category [Line Items] | |||
| Gross investment income | $ 887 | $ 796 | $ 448 |