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Commitments and Contingencies - Restricted Assets (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Dec. 31, 2023
Loss Contingencies [Line Items]    
Fixed maturity collateral pledged to FHLB $ 1,809 $ 1,956
FHLB restricted stock 63 64
Other fixed maturities-state deposits 39 37
Cash and cash equivalents 24 25
Total restricted assets 3,209 3,242
Collateral Pledged    
Loss Contingencies [Line Items]    
Securities pledged 1,274 1,160
Securities pledged as collateral    
Loss Contingencies [Line Items]    
Fair value of loaned securities 941 842
Securities pledged under repurchase agreements, carrying value 162 117
Securities Loaned    
Loss Contingencies [Line Items]    
Securities pledged as collateral $ 171 $ 201