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Investments (Amortized Cost and Fair Value of Fixed Maturity Holdings by Industry Type) (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Corporate Securities by Investment Sector And Credit Rating [Line Items]    
Amortized Cost $ 104,461 $ 82,907
Fixed maturity securities, available-for-sale 99,573 [1] 77,617 [2]
Corporate Debt Securities [Member]    
Corporate Securities by Investment Sector And Credit Rating [Line Items]    
Amortized Cost 69,884 54,705
Fixed maturity securities, available-for-sale $ 67,177 [1] $ 50,991 [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 $ 20,809 $ 17,905
Fixed maturity securities, available-for-sale $ 19,958 $ 16,673
Percentage Of Total Corporate Fixed Maturity Security 29.70% 32.70%
Corporate Debt Securities [Member] | Industrial    
Corporate Securities by Investment Sector And Credit Rating [Line Items]    
Amortized Cost $ 37,617 $ 28,267
Fixed maturity securities, available-for-sale $ 36,291 $ 26,476
Percentage Of Total Corporate Fixed Maturity Security 54.00% 51.90%
Corporate Debt Securities [Member] | Utility    
Corporate Securities by Investment Sector And Credit Rating [Line Items]    
Amortized Cost $ 11,458 $ 8,533
Fixed maturity securities, available-for-sale $ 10,928 $ 7,842
Percentage Of Total Corporate Fixed Maturity Security 16.30% 15.40%
[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, 2025, the fair value of such investments was $940 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, 2024, the fair value of such investments was $966 million