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Investments (Fixed Maturity Securities Available-For-Sale by Sector) (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]      
Amortized Cost $ 306,025 $ 310,884  
Allowance for Credit Loss for Debt Securities (183) (91) $ (81)
Gross Unrealized Gains 5,239 31,901  
Gross Unrealized Losses 34,301 2,420  
Estimated Fair Value of Fixed Maturity Securities AFS 276,780 340,274  
U.S. corporate      
Debt Securities, Available-for-sale [Line Items]      
Amortized Cost 88,466 82,694  
Allowance for Credit Loss for Debt Securities (29) (30) (44)
Gross Unrealized Gains 1,133 10,651  
Gross Unrealized Losses 9,540 281  
Estimated Fair Value of Fixed Maturity Securities AFS 80,030 93,034  
Foreign corporate      
Debt Securities, Available-for-sale [Line Items]      
Amortized Cost 59,696 59,124  
Allowance for Credit Loss for Debt Securities (5) (28) (16)
Gross Unrealized Gains 1,213 5,275  
Gross Unrealized Losses 8,332 731  
Estimated Fair Value of Fixed Maturity Securities AFS 52,572 63,640  
Foreign government      
Debt Securities, Available-for-sale [Line Items]      
Amortized Cost 50,047 56,848  
Allowance for Credit Loss for Debt Securities (130) (19) (21)
Gross Unrealized Gains 1,876 5,603  
Gross Unrealized Losses 5,046 823  
Estimated Fair Value of Fixed Maturity Securities AFS 46,747 61,609  
U.S. government and agency      
Debt Securities, Available-for-sale [Line Items]      
Amortized Cost 35,658 41,068  
Allowance for Credit Loss for Debt Securities 0 0  
Gross Unrealized Gains 431 5,807  
Gross Unrealized Losses 3,860 276  
Estimated Fair Value of Fixed Maturity Securities AFS 32,229 46,599  
RMBS      
Debt Securities, Available-for-sale [Line Items]      
Amortized Cost 29,496 29,152  
Allowance for Credit Loss for Debt Securities 0 0  
Gross Unrealized Gains 187 1,440  
Gross Unrealized Losses 3,518 188  
Estimated Fair Value of Fixed Maturity Securities AFS 26,165 30,404  
ABS & CLO      
Debt Securities, Available-for-sale [Line Items]      
Amortized Cost 17,991 18,443  
Allowance for Credit Loss for Debt Securities 0 0  
Gross Unrealized Gains 23 185  
Gross Unrealized Losses 1,192 59  
Estimated Fair Value of Fixed Maturity Securities AFS 16,822 18,569  
Municipals      
Debt Securities, Available-for-sale [Line Items]      
Amortized Cost 13,548 11,761  
Allowance for Credit Loss for Debt Securities 0 0  
Gross Unrealized Gains 317 2,464  
Gross Unrealized Losses 1,713 13  
Estimated Fair Value of Fixed Maturity Securities AFS 12,152 14,212  
CMBS      
Debt Securities, Available-for-sale [Line Items]      
Amortized Cost 11,123 11,794  
Allowance for Credit Loss for Debt Securities (19) (14) $ 0
Gross Unrealized Gains 59 476  
Gross Unrealized Losses 1,100 49  
Estimated Fair Value of Fixed Maturity Securities AFS $ 10,063 $ 12,207