Commitments and Contingencies - Restricted Assets (Details) - USD ($) $ in Millions	Jun. 30, 2025	Dec. 31, 2024
Loss Contingencies [Line Items]
Fixed maturity collateral pledged to FHLB	$ 2,294	$ 2,007
FHLB restricted stock	71	65
Other fixed maturities-state deposits	40	35
Cash and cash equivalents	23	21
Total restricted assets	3,505	3,651
Collateral Pledged
Loss Contingencies [Line Items]
Debt Securities, Available-for-Sale, Restricted	1,077	1,523
Securities pledged as collateral
Loss Contingencies [Line Items]
Fair value of loaned securities	722	1,083
Securities pledged under repurchase agreements, carrying value	185	281
Securities Loaned
Loss Contingencies [Line Items]
Securities pledged as collateral	$ 170	$ 159

Amount of restricted investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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