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Commitments and Contingencies - Restricted Assets (Details) - USD ($)
$ in Millions
Mar. 31, 2025
Dec. 31, 2024
Loss Contingencies [Line Items]    
Fixed maturity collateral pledged to FHLB $ 2,041 $ 2,007
FHLB restricted stock 67 65
Other fixed maturities-state deposits 39 35
Cash and cash equivalents 22 21
Total restricted assets 3,562 3,651
Collateral Pledged    
Loss Contingencies [Line Items]    
Securities pledged 1,393 1,523
Securities pledged as collateral    
Loss Contingencies [Line Items]    
Fair value of loaned securities 755 1,083
Securities pledged under repurchase agreements, carrying value 482 281
Securities Loaned    
Loss Contingencies [Line Items]    
Securities pledged as collateral $ 156 $ 159