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Derivatives - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Gains (losses) on interest rate swaps expected to be reclassified from AOCI to net earnings over the next 12 months.     $ (17)    
Interest rate swaps | Designated as hedging instrument | Net investment income          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Reclassification from accumulated other comprehensive income $ (7) $ (7) (14) $ (12)  
Interest rate swaps | Cash flow hedging | Designated as hedging instrument          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Derivative, notional amount 1,190   1,190   $ 1,300
Collateral receivable supporting swaps 47   47   48
Total return swap | Not designated as hedging instrument          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Liability to return collateral related to swaps $ 1   $ 1   $ 5