Investments - Schedule of Rollforward of Credit Loss Allowance for Fixed Income Securities (Details) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
|
| Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward] | ||||
| Ending balance | $ (10) | $ (17) | $ (10) | $ (17) |
| Fixed income securities | ||||
| Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward] | ||||
| Beginning balance | (10) | (18) | (10) | (17) |
| Credit losses on securities for which credit losses not previously reported | 0 | 0 | 0 | (1) |
| Net (increases) decreases related to credit losses previously reported | 0 | 1 | 0 | 1 |
| Write-offs | 0 | 0 | 0 | 0 |
| Ending balance | (10) | (17) | (10) | (17) |
| Corporate bonds | ||||
| Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward] | ||||
| Ending balance | (8) | (16) | (8) | (16) |
| ABS | ||||
| Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward] | ||||
| Ending balance | $ (2) | $ (1) | $ (2) | $ (1) |