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Investments (Amortized Cost and Fair Value of Fixed Maturity Holdings by Industry Type) (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Corporate Secturities by Investment Sector And Credit Rating [Line Items]    
Available for Sale at Fair value - Amortized cost $ 64,977 $ 59,663
Fixed maturity securities available-for-sale at fair value (amortized cost of $64,977 and $59,663; allowance for credit losses of $75 and $37) 60,467 [1] 52,901 [2]
Corporate Debt Securities [Member]    
Corporate Secturities by Investment Sector And Credit Rating [Line Items]    
Available for Sale at Fair value - Amortized cost 42,014 38,963
Fixed maturity securities available-for-sale at fair value (amortized cost of $64,977 and $59,663; allowance for credit losses of $75 and $37) $ 38,755 [1] $ 33,969 [2]
Percentage Of Total Available For Sales Securities 100.00% 100.00%
Financial Services Sector [Member] | Corporate Debt Securities [Member]    
Corporate Secturities by Investment Sector And Credit Rating [Line Items]    
Available for Sale at Fair value - Amortized cost $ 15,052 $ 14,551
Fixed maturity securities available-for-sale at fair value (amortized cost of $64,977 and $59,663; allowance for credit losses of $75 and $37) $ 13,789 $ 12,680
Percentage Of Total Available For Sales Securities 35.60% 37.30%
Commercial and Industrial Sector [Member] | Corporate Debt Securities [Member]    
Corporate Secturities by Investment Sector And Credit Rating [Line Items]    
Available for Sale at Fair value - Amortized cost $ 21,413 $ 19,624
Fixed maturity securities available-for-sale at fair value (amortized cost of $64,977 and $59,663; allowance for credit losses of $75 and $37) $ 19,935 $ 17,257
Percentage Of Total Available For Sales Securities 51.40% 50.80%
Utility Industry [Member] | Corporate Debt Securities [Member]    
Corporate Secturities by Investment Sector And Credit Rating [Line Items]    
Available for Sale at Fair value - Amortized cost $ 5,549 $ 4,788
Fixed maturity securities available-for-sale at fair value (amortized cost of $64,977 and $59,663; allowance for credit losses of $75 and $37) $ 5,031 $ 4,032
Percentage Of Total Available For Sales Securities 13.00% 11.90%
[1] Excludes limited partnerships that are measured at estimated fair value using the NAV per share (or its equivalent) as a practical expedient. As of December 31, 2023, the fair value of such investments was $856 million
[2] Excludes limited partnerships that are measured at estimated fair value using the NAV per share (or its equivalent) as a practical expedient. As of December 31, 2022, the fair value of such investments was $683 million.