Investments - Rollforward of Changes in Allowance for Credit Losses on Available for Sale Fixed Maturity Securities by Major Investment Category (Details) - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2026 |
Sep. 30, 2025 |
Sep. 30, 2026 |
Sep. 30, 2025 |
|
| Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward] | ||||
| Balance, beginning of period | $ 35 | $ 45 | $ 37 | $ 38 |
| Securities for which allowance for credit losses was not previously recorded | (3) | 2 | 11 | 22 |
| Securities sold during the period | (4) | 0 | (9) | (6) |
| Addition to (release of) the allowance for credit losses on securities that had an allowance recorded in a previous period, for which there was no intent to sell before recovery of amortized cost basis | (1) | 3 | (12) | 5 |
| Write-offs charged against the allowance | (3) | (5) | (3) | (14) |
| Other | 0 | (2) | 0 | (2) |
| Balance, end of period | $ 24 | $ 43 | $ 24 | $ 43 |