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Commitments and Contingencies - Restricted Assets (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Loss Contingencies [Line Items]    
Fixed maturity collateral pledged to FHLB $ 2,323 $ 2,007
FHLB restricted stock 75 65
Other fixed maturities-state deposits 35 35
Cash and cash equivalents 28 21
Total restricted assets 3,858 3,651
Collateral Pledged    
Loss Contingencies [Line Items]    
Debt Securities, Available-for-Sale, Restricted 1,397 1,523
Securities pledged as collateral    
Loss Contingencies [Line Items]    
Fair value of loaned securities 747 1,083
Securities pledged under repurchase agreements, carrying value 428 281
Securities Loaned    
Loss Contingencies [Line Items]    
Securities pledged as collateral $ 222 $ 159