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Investments (Maturities of Fixed Maturity Securities) (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Available-for-sale Securities, Debt Maturities [Abstract]    
Amortized Cost, Due in one year or less $ 12,007  
Amortized Cost, Due after one year through five years 48,386  
Amortized Cost, Due after five years through ten years 58,346  
Amortized Cost, Due after ten years 130,763  
Amortized Cost, Structured Securities 55,161  
Amortized Cost, net of ACL 304,663  
Estimated Fair Value, Due in one year or less 12,163  
Estimated Fair Value, Due after one year through five years 51,148  
Estimated Fair Value, Due after five years through ten years 64,779  
Estimated Fair Value, Due after ten years 147,546  
Estimated Fair Value, Structured Securities 57,305  
Estimated Fair Value of Fixed Maturity Securities AFS $ 332,941 $ 354,809