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Investments (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Gain (Loss) on Securities [Line Items]          
Reduction of net unrealized gains on investments included in AOCI due to shadow adjustments $ 482   $ 482   $ 2,477
Notional value 285   285   270
Other liabilities 41   41   (12)
Commitments to purchase or fund privately placed debt securities 1,455   1,455    
Commitments to sell various privately placed debt securities 25   25    
Common Stock          
Gain (Loss) on Securities [Line Items]          
Equity securities, FV-NI, gain (loss) (22) $ 9 (23) $ 21  
Non-redeemable preferred stock          
Gain (Loss) on Securities [Line Items]          
Equity securities, FV-NI, gain (loss) (70) 15 (108) 15  
Mortgage loans          
Gain (Loss) on Securities [Line Items]          
Financing receivable, accrued interest, after allowance for credit loss 3   3    
Fixed maturity securities          
Gain (Loss) on Securities [Line Items]          
Debt securities, available-for-sale, accrued interest, after allowance for credit loss $ 374 $ 374 $ 374 $ 374 $ 369