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Investments - Schedule of Amortized Cost and Fair Value of Fixed Maturity Available-for-Sale Securities (Details) - USD ($)
$ in Millions
Mar. 31, 2025
Dec. 31, 2024
Amortized Cost    
Other securities which provide for periodic payments, Amortized Cost $ 24,534 $ 24,032
Amortized Cost 52,973 51,681
Fair Value    
Other securities which provide for periodic payments, Fair Value 24,158 23,634
Total fixed maturity available-for-sale securities, Fair Value 49,824 48,218
Corporates, Non-structured Hybrids, Municipal and Government securities:    
Amortized Cost    
Due in one year or less 1,003 961
Due after one year through five years 5,118 4,616
Due after five years through ten years 5,519 5,311
Due after ten years 16,799 16,761
Subtotal, Amortized Cost 28,439 27,649
Fair Value    
Due in one year or less 999 955
Due after one year through five years 5,086 4,544
Due after five years through ten years 5,404 5,126
Due after ten years 14,177 13,959
Subtotal, Fair Value 25,666 24,584
Asset-backed securities    
Amortized Cost    
Other securities which provide for periodic payments, Amortized Cost 16,435 15,784
Amortized Cost 16,435 15,784
Fair Value    
Other securities which provide for periodic payments, Fair Value 16,268 15,656
Total fixed maturity available-for-sale securities, Fair Value 16,268 15,656
Commercial mortgage-backed securities    
Amortized Cost    
Other securities which provide for periodic payments, Amortized Cost 5,312 5,379
Amortized Cost 5,312 5,379
Fair Value    
Other securities which provide for periodic payments, Fair Value 5,142 5,182
Total fixed maturity available-for-sale securities, Fair Value 5,142 5,182
Residential mortgage-backed securities    
Amortized Cost    
Other securities which provide for periodic payments, Amortized Cost 2,787 2,869
Amortized Cost 2,787 2,869
Fair Value    
Other securities which provide for periodic payments, Fair Value 2,748 2,796
Total fixed maturity available-for-sale securities, Fair Value $ 2,748 $ 2,796