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Investments - Amortized Cost and Fair Value of Fixed Maturity Available-for-Sale Securities (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Dec. 31, 2023
Amortized Cost    
Other securities which provide for periodic payments, Amortized Cost $ 23,447 $ 21,935
Amortized Cost 49,229 45,606
Fair Value    
Other securities which provide for periodic payments, Fair Value 23,002 21,246
Total fixed maturity available-for-sale securities, Fair Value 45,746 42,373
Corporates, Non-structured Hybrids, Municipal and Government securities:    
Amortized Cost    
Due in one year or less 815 703
Due after one year through five years 4,877 4,320
Due after five years through ten years 4,160 3,195
Due after ten years 15,930 15,453
Subtotal, Amortized Cost 25,782 23,671
Fair Value    
Due in one year or less 800 687
Due after one year through five years 4,743 4,209
Due after five years through ten years 3,990 3,048
Due after ten years 13,211 13,183
Subtotal, Fair Value 22,744 21,127
Asset-backed securities    
Amortized Cost    
Other securities which provide for periodic payments, Amortized Cost 15,689 14,631
Amortized Cost 15,689 14,631
Fair Value    
Other securities which provide for periodic payments, Fair Value 15,559 14,342
Total fixed maturity available-for-sale securities, Fair Value 15,559 14,342
Commercial mortgage-backed securities    
Amortized Cost    
Other securities which provide for periodic payments, Amortized Cost 5,217 4,797
Amortized Cost 5,217 4,797
Fair Value    
Other securities which provide for periodic payments, Fair Value 4,989 4,475
Total fixed maturity available-for-sale securities, Fair Value 4,989 4,475
Residential mortgage-backed securities    
Amortized Cost    
Other securities which provide for periodic payments, Amortized Cost 2,541 2,507
Fair Value    
Other securities which provide for periodic payments, Fair Value $ 2,454 $ 2,429