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Investments (Maturities of Fixed Maturity Securities) (Details) - USD ($)
$ in Millions
Mar. 31, 2023
Dec. 31, 2022
Investments, Debt and Equity Securities [Abstract]    
Amortized cost, due in one year or less $ 1,556  
Amortized cost, due after one year through five years 14,307  
Amortized cost, due after five years through ten years 16,379  
Amortized cost, due after ten years 30,916  
Amortized cost, Structured Securities 21,535  
Fixed maturity securities, amortized cost 84,693 $ 84,344
Estimated fair value, due in one year or less 1,528  
Estimated fair value, due after one year through five years 13,669  
Estimated fair value, due after five years through ten years 14,794  
Estimated fair value, due after ten years 27,834  
Estimated fair value, Structured Securities 19,860  
Fixed maturity securities, estimated fair value $ 77,685 $ 75,577