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 | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
|
| Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward] | ||||
| Balance, beginning of period | $ 38 | $ 30 | $ 37 | $ 38 |
| Securities for which allowance for credit losses was not previously recorded | 8 | 18 | 14 | 20 |
| Securities sold during the period | (2) | (2) | (5) | (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 | (9) | 0 | (11) | 2 |
| Write-offs charged against the allowance | 0 | (1) | 0 | (9) |
| Balance, end of period | 35 | 45 | 35 | 45 |
| Gross Realized Gains | $ 18 | $ 14 | $ 38 | $ 30 |