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Investments (Amortized Cost and Fair Value of Fixed Maturity Holdings by Industry Type) (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
Corporate Securities by Investment Sector And Credit Rating [Line Items]    
Amortized Cost $ 81,606 $ 64,977
Fixed maturity securities, available-for-sale 78,149 [1] 60,467 [2]
Corporate Debt Securities [Member]    
Corporate Securities by Investment Sector And Credit Rating [Line Items]    
Amortized Cost 53,327 42,014
Fixed maturity securities, available-for-sale $ 51,087 [1] $ 38,755 [2]
Percentage Of Total Corporate Fixed Maturity Security 100.00% 100.00%
Corporate Debt Securities [Member] | Finance    
Corporate Securities by Investment Sector And Credit Rating [Line Items]    
Amortized Cost $ 17,482 $ 15,052
Fixed maturity securities, available-for-sale $ 16,641 $ 13,789
Percentage Of Total Corporate Fixed Maturity Security 32.60% 35.60%
Corporate Debt Securities [Member] | Industrial    
Corporate Securities by Investment Sector And Credit Rating [Line Items]    
Amortized Cost $ 27,697 $ 21,413
Fixed maturity securities, available-for-sale $ 26,682 $ 19,935
Percentage Of Total Corporate Fixed Maturity Security 52.20% 51.40%
Corporate Debt Securities [Member] | Utility    
Corporate Securities by Investment Sector And Credit Rating [Line Items]    
Amortized Cost $ 8,148 $ 5,549
Fixed maturity securities, available-for-sale $ 7,764 $ 5,031
Percentage Of Total Corporate Fixed Maturity Security 15.20% 13.00%
[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 September 30, 2024, the fair value of such investments was $921 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, 2023, the fair value of such investments was $856 million