Investments (excluding Consolidated Investment Entities) - Net Investment Income (Details) - USD ($) |
3 Months Ended | 6 Months Ended | |||
|---|---|---|---|---|---|
Jun. 30, 2025 |
Jun. 30, 2024 |
Jun. 30, 2025 |
Jun. 30, 2024 |
Dec. 31, 2024 |
|
| Net Investment Income [Line Items] | |||||
| Gross investment income | $ 606,000,000 | $ 536,000,000 | $ 1,188,000,000 | $ 1,082,000,000 | |
| Less: Investment expenses | 22,000,000 | 18,000,000 | 44,000,000 | 35,000,000 | |
| Net investment income | 584,000,000 | 518,000,000 | 1,144,000,000 | 1,047,000,000 | |
| Fixed maturity securities on non-accrual status | 0 | 0 | $ 26,000,000 | ||
| Fixed maturities | |||||
| Net Investment Income [Line Items] | |||||
| Gross investment income | 462,000,000 | 416,000,000 | 927,000,000 | 832,000,000 | |
| Fixed maturity securities on non-accrual status | 12,000,000 | 12,000,000 | $ 18,000,000 | ||
| Equity securities | |||||
| Net Investment Income [Line Items] | |||||
| Gross investment income | 5,000,000 | 4,000,000 | 8,000,000 | 9,000,000 | |
| Mortgage loans on real estate | |||||
| Net Investment Income [Line Items] | |||||
| Gross investment income | 69,000,000 | 60,000,000 | 136,000,000 | 121,000,000 | |
| Policy loans | |||||
| Net Investment Income [Line Items] | |||||
| Gross investment income | 5,000,000 | 4,000,000 | 10,000,000 | 10,000,000 | |
| Short-term investments and cash equivalents | |||||
| Net Investment Income [Line Items] | |||||
| Gross investment income | 10,000,000 | 10,000,000 | 20,000,000 | 20,000,000 | |
| Limited partnerships and other | |||||
| Net Investment Income [Line Items] | |||||
| Gross investment income | $ 55,000,000 | $ 42,000,000 | $ 87,000,000 | $ 90,000,000 | |