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Investments - Schedule of Amortized Cost and Fair Value of Fixed Maturity Available-for-Sale Securities (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Amortized Cost    
Other securities which provide for periodic payments, Amortized Cost $ 26,846 $ 24,032
Amortized Cost 55,913 51,681
Fair Value    
Other securities which provide for periodic payments, Fair Value 26,624 23,634
Total fixed maturity available-for-sale securities, Fair Value 53,501 48,218
Corporates, Non-structured Hybrids, Municipal and Government securities:    
Amortized Cost    
Due in one year or less 860 961
Due after one year through five years 5,193 4,616
Due after five years through ten years 5,532 5,311
Due after ten years 17,482 16,761
Subtotal, Amortized Cost 29,067 27,649
Fair Value    
Due in one year or less 852 955
Due after one year through five years 5,217 4,544
Due after five years through ten years 5,545 5,126
Due after ten years 15,263 13,959
Subtotal, Fair Value 26,877 24,584
Asset-backed securities    
Amortized Cost    
Other securities which provide for periodic payments, Amortized Cost 18,346 15,784
Amortized Cost 18,346 15,784
Fair Value    
Other securities which provide for periodic payments, Fair Value 18,265 15,656
Total fixed maturity available-for-sale securities, Fair Value 18,265 15,656
Commercial mortgage-backed securities    
Amortized Cost    
Other securities which provide for periodic payments, Amortized Cost 5,525 5,379
Amortized Cost 5,525 5,379
Fair Value    
Other securities which provide for periodic payments, Fair Value 5,388 5,182
Total fixed maturity available-for-sale securities, Fair Value 5,388 5,182
Residential mortgage-backed securities    
Amortized Cost    
Other securities which provide for periodic payments, Amortized Cost 2,975 2,869
Amortized Cost 2,975 2,869
Fair Value    
Other securities which provide for periodic payments, Fair Value 2,971 2,796
Total fixed maturity available-for-sale securities, Fair Value $ 2,971 $ 2,796