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Investments - Amortized Cost and Fair Value of Fixed Maturity Available-for-Sale Securities (Details) - USD ($)
$ in Millions
Mar. 31, 2022
Dec. 31, 2021
Amortized Cost    
Total fixed maturity available-for-sale securities, Fair Value $ 32,508 $ 30,705
Fair Value    
Total fixed maturity available-for-sale securities, Fair Value 31,478 31,990
Other securities which provide for periodic payments:    
Amortized Cost    
Other securities which provide for periodic payments, Amortized Cost 12,915 11,962
Fair Value    
Other securities which provide for periodic payments, Fair Value 12,900 12,442
Corporates, Non-structured Hybrids, Municipal and Government securities:    
Amortized Cost    
Due in one year or less 439 426
Due after one year through five years 3,320 2,998
Due after five years through ten years 2,378 2,389
Due after ten years 13,456 12,930
Subtotal, Amortized Cost 19,593 18,743
Fair Value    
Due in one year or less 444 431
Due after one year through five years 3,249 3,051
Due after five years through ten years 2,295 2,458
Due after ten years 12,590 13,608
Subtotal, Fair Value 18,578 19,548
Asset-backed securities    
Amortized Cost    
Other securities which provide for periodic payments, Amortized Cost 9,137 8,516
Total fixed maturity available-for-sale securities, Fair Value 9,137 8,516
Fair Value    
Other securities which provide for periodic payments, Fair Value 9,058 8,695
Total fixed maturity available-for-sale securities, Fair Value 9,058 8,695
Commercial mortgage-backed securities    
Amortized Cost    
Other securities which provide for periodic payments, Amortized Cost 2,951 2,684
Total fixed maturity available-for-sale securities, Fair Value 2,951 2,684
Fair Value    
Other securities which provide for periodic payments, Fair Value 3,052 2,979
Total fixed maturity available-for-sale securities, Fair Value 3,052 2,979
Structured hybrids    
Amortized Cost    
Other securities which provide for periodic payments, Amortized Cost 26 31
Fair Value    
Other securities which provide for periodic payments, Fair Value 29 37
Residential mortgage-backed securities    
Amortized Cost    
Other securities which provide for periodic payments, Amortized Cost 801 731
Fair Value    
Other securities which provide for periodic payments, Fair Value $ 761 $ 731