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Derivative Financial Instruments - Carrying Amount and Cumulative Adjustment (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Derivative Instruments and Hedging Activities Disclosure [Abstract]    
Carrying Amount of Hedged Assets $ 21 $ 0
Carrying Amount of Hedged (Liabilities) (867) 0
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) $ (12) $ 0
Hedged Asset, Statement of Financial Position Flag Fair Value/Carrying Value Fair Value/Carrying Value
Hedged Liability, Statement of Financial Position Flag Contractholder funds Contractholder funds