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Investments (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Gain (Loss) on Securities [Line Items]      
Reduction of net unrealized gains on investments included in AOCI due to shadow adjustments $ 1,394   $ 2,477
Notional value 268   270
Derivative liability, fair value, gross liability 16   12
Commitments to purchase or fund privately placed debt securities 1,280    
Commitments to sell various privately placed debt securities 65    
Common Stock      
Gain (Loss) on Securities [Line Items]      
Equity securities, FV-NI, gain (loss) (5) $ 13  
Non-redeemable preferred stock      
Gain (Loss) on Securities [Line Items]      
Equity securities, FV-NI, gain (loss) 38 2  
Mortgage loans      
Gain (Loss) on Securities [Line Items]      
Financing receivable, accrued interest, after allowance for credit loss 3    
Fixed maturity securities      
Gain (Loss) on Securities [Line Items]      
Debt securities, available-for-sale, accrued interest, after allowance for credit loss $ 389 $ 389 $ 369