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Investments (Maturities of Fixed Maturity Securities) (Details) - USD ($)
$ in Millions
Mar. 31, 2024
Dec. 31, 2023
Investments, Debt and Equity Securities [Abstract]    
Amortized cost, due in one year or less $ 3,336  
Amortized cost, due after one year through five years 17,921  
Amortized cost, due after five years through ten years 14,621  
Amortized cost, due after ten years 29,786  
Amortized cost, Structured Securities 21,891  
Fixed maturity securities, amortized cost 87,555 $ 87,131
Estimated fair value, due in one year or less 3,291  
Estimated fair value, due after one year through five years 17,321  
Estimated fair value, due after five years through ten years 13,265  
Estimated fair value, due after ten years 26,216  
Estimated fair value, Structured Securities 20,381  
Fixed maturity securities, estimated fair value $ 80,474 $ 80,991