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Investments (Invested Assets on Deposit, Held in Trust and Pledged as Collateral - Narrative) (Details) - USD ($)
$ in Millions
Mar. 31, 2024
Dec. 31, 2023
Restricted Cash and Cash Equivalents Items [Line Items]    
Invested assets on deposit (regulatory deposits) $ 8,529 $ 8,593
Invested assets held in trust (reinsurance agreements) 7,151 7,142
Restricted Cash and Cash Equivalents    
Restricted Cash and Cash Equivalents Items [Line Items]    
Invested assets on deposit (regulatory deposits) 37 102
Invested assets held in trust (reinsurance agreements) 99 120
FHLB common stock $ 245 $ 245