Investments (Rollforward of expected credit losses Private Debt HFI) (Details) - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2026 |
Sep. 30, 2025 |
Sep. 30, 2026 |
Sep. 30, 2025 |
|
| Private Debt, Held-for-investment, Allowance for Credit Loss [Line Items] | ||||
| Private Debt Held-for-investment, Allowance for Credit Loss, Beginning Balance | $ 2 | $ 3 | $ 3 | $ 4 |
| Private Debt Held-for-investment, Allowance for Credit Loss, Period Increase (Decrease) | 1 | 1 | 1 | 1 |
| Private Debt Held-for-investment, Allowance for Credit Loss, Recovery | (1) | (1) | (2) | (2) |
| Private Debt Held-for-investment, Allowance for Credit Loss, Ending Balance | $ 2 | $ 3 | $ 2 | $ 3 |