Derivative Financial Instruments - Carrying Amount and Cumulative Adjustment (Details) - USD ($) $ in Millions |
Sep. 30, 2026 |
Dec. 31, 2025 |
|---|---|---|
| Derivative Instruments and Hedging Activities Disclosure [Abstract] | ||
| Carrying Amount of Hedged Assets | $ 0 | $ 21 |
| Carrying Amount of Hedged (Liabilities) | (1,638) | (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) | $ 41 | $ (11) |
| Hedged Asset, Statement of Financial Position Flag | Fixed maturity securities available for sale, at fair value, net of allowance for credit losses of $71 in 2026 and $104 in 2025 (amortized cost: $55,495 in 2026 and $55,292 in 2025) | Fixed maturity securities available for sale, at fair value, net of allowance for credit losses of $71 in 2026 and $104 in 2025 (amortized cost: $55,495 in 2026 and $55,292 in 2025) |
| Hedged Liability, Statement of Financial Position Flag | Contractholder funds | Contractholder funds |