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Market Risk Benefits (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Dec. 31, 2022
Variable Annuities        
Market Risk Benefit [Line Items]        
Market Risk Benefit, after Increase (Decrease) from Instrument-Specific Credit Risk $ 8,144 $ 10,286 $ 9,701 $ 9,974
Market Risk Benefit, before Reinsurance and Cumulative Increase (Decrease) from Instrument-Specific Credit Risk Change 5,987 8,534 $ 7,326 $ 8,230
Market Risk Benefit, Decrements (30) (28)    
Market Risk Benefit, Increase (Decrease) from Actual Policyholder Behavior Different from Expected 0 122    
Market Risk Benefit, Increase (Decrease) from Interest Rate Change (988) 880    
Market Risk Benefit, Increase (Decrease) from Equity Market Change (630) (1,002)    
Market Risk Benefit, Issuance 0 (3)    
Market Risk Benefit, Effect of changes in risk margin (39) 9    
Market Risk Benefit, Aging of the Block and Other 348 326    
AOCI, Market Risk Benefit, Instrument-Specific Credit Risk, before Tax 2,157 1,752    
Market Risk Benefit, Reinsurance Recoverable, after Allowance 27 71    
Market Risk Benefit, after Reinsurance and Cumulative Increase (Decrease) from Instrument-Specific Credit Risk Change $ 8,117 $ 10,215    
Market Risk Benefit, Weighted-Average Attained Age of Contract holder 73 years 2 months 12 days 72 years 1 month 6 days    
Index-linked Annuities        
Market Risk Benefit [Line Items]        
Market Risk Benefit, after Increase (Decrease) from Instrument-Specific Credit Risk $ 8 $ 4