Reinsurance - Schedule of Components of Company's Reinsurance Recoverable on Market Risk Benefits (Details) - USD ($) $ in Millions |
Mar. 31, 2026 |
Dec. 31, 2025 |
|---|---|---|
| Effects of Reinsurance [Line Items] | ||
| Reinsurance recoverable on market risk benefits, at fair value | $ 121 | $ 118 |
| Variable annuity | ||
| Effects of Reinsurance [Line Items] | ||
| Reinsurance recoverable on market risk benefits, at fair value | 43 | 41 |
| Other product lines | ||
| Effects of Reinsurance [Line Items] | ||
| Reinsurance recoverable on market risk benefits, at fair value | $ 78 | $ 77 |