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Investments - Amortized Cost and Fair Value of Fixed Maturity Available-for-Sale Securities (Details) - USD ($)
$ in Millions
Mar. 31, 2024
Dec. 31, 2023
Amortized Cost    
Other securities which provide for periodic payments, Amortized Cost $ 22,844 $ 21,935
Amortized Cost 47,789 45,606
Fair Value    
Other securities which provide for periodic payments, Fair Value 22,397 21,246
Total fixed maturity available-for-sale securities, Fair Value 44,566 42,373
Corporates, Non-structured Hybrids, Municipal and Government securities:    
Amortized Cost    
Due in one year or less 709 703
Due after one year through five years 4,765 4,320
Due after five years through ten years 3,940 3,195
Due after ten years 15,531 15,453
Subtotal, Amortized Cost 24,945 23,671
Fair Value    
Due in one year or less 691 687
Due after one year through five years 4,643 4,209
Due after five years through ten years 3,770 3,048
Due after ten years 13,065 13,183
Subtotal, Fair Value 22,169 21,127
Asset-backed securities    
Amortized Cost    
Other securities which provide for periodic payments, Amortized Cost 15,254 14,631
Amortized Cost 15,254 14,631
Fair Value    
Other securities which provide for periodic payments, Fair Value 15,115 14,342
Total fixed maturity available-for-sale securities, Fair Value 15,115 14,342
Commercial mortgage-backed securities    
Amortized Cost    
Other securities which provide for periodic payments, Amortized Cost 5,040 4,797
Amortized Cost 5,040 4,797
Fair Value    
Other securities which provide for periodic payments, Fair Value 4,818 4,475
Total fixed maturity available-for-sale securities, Fair Value 4,818 4,475
Residential mortgage-backed securities    
Amortized Cost    
Other securities which provide for periodic payments, Amortized Cost 2,550 2,507
Fair Value    
Other securities which provide for periodic payments, Fair Value $ 2,464 $ 2,429