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Derivative Financial Instruments - Carrying Amount and Cumulative Adjustment (Details) - USD ($) $ in Millions | Mar. 31, 2025 | Dec. 31, 2024
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Derivative Instruments and Hedging Activities Disclosure [Abstract] |  |
Carrying Amount of Hedged Assets | $ 21 | $ 0
Carrying Amount of Hedged (Liabilities) | (360) | 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) | $ (10) | $ 0
Hedged Asset, Statement of Financial Position [Extensible Enumeration] | Fair Value/Carrying Value | Fair Value/Carrying Value
Hedged Liability, Statement of Financial Position [Extensible Enumeration] | Contractholder funds | Contractholder funds

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