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Investments (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Gain (Loss) on Securities [Line Items]          
Investment and derivative, realized gain (loss), coinsurance agreement $ (35)        
Debt securities, available-for-sale, realized loss 134 $ 28 $ 222 $ 68  
Embedded derivative, gain on embedded derivative 24        
Financing receivable, credit loss, expense (reversal) 8 0 8 0  
Impairment losses (gains) recognized in earnings 25 11 55 16  
Reduction of net unrealized gains on investments included in AOCI due to shadow adjustments 46   46   $ 2,477
Notional value 220   220   270
Other liabilities 1   1   (12)
Commitments to purchase or fund privately placed debt securities 1,595   1,595    
Commitments to sell various privately placed debt securities 100   100    
Funds Withheld Liability Securities          
Gain (Loss) on Securities [Line Items]          
Debt securities, available-for-sale, realized loss (59)        
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 $ 401 $ 387 $ 401 $ 387 $ 369