Derivative Financial Instruments - Schedule of Carrying Amount and Cumulative Adjustment (Details) - USD ($) $ in Millions |
Mar. 31, 2026 |
Dec. 31, 2025 |
|---|---|---|
| Derivative Instruments and Hedging Activities Disclosure [Abstract] | ||
| Hedged Asset, Statement of Financial Position Flag | Fair Value | Fair Value |
| Hedged Liability, Statement of Financial Position Flag | Contractholder funds | Contractholder funds |
| Carrying Amount of Hedged Assets | $ 0 | $ 21 |
| Carrying Amount of Hedged (Liabilities) | (1,611) | (862) |
| Cumulative Amount of Fair Value Hedging Adjustment included in the Carrying Amount of the Hedged Assets | 0 | 0 |
| Cumulative Amount of Fair Value Hedging Adjustment included in the Carrying Amount of the Hedged (Liabilities) | $ 0 | $ (11) |