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Investments - Amortized Cost and Fair Value of Fixed Maturity Available-for-Sale Securities (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]    
Due in one year or less, Amortized Cost $ 961 $ 703
Due after one year through five years, Amortized Cost 4,616 4,320
Due after five years through ten years, Amortized Cost 5,311 3,195
Due after ten years, Amortized Cost 16,761 15,453
Subtotal, Amortized Cost 27,649 23,671
Other securities which provide for periodic payments, Amortized Cost 24,032 21,935
Due in one year or less, Fair Value 955 687
Due after one year through five years, Fair Value 4,544 4,209
Due after five years through ten years, Fair Value 5,126 3,048
Due after ten years, Fair Value 13,959 13,183
Subtotal, Fair Value 24,584 21,127
Other securities which provide for periodic payments, Fair Value 23,634 21,246
Amortized Cost 51,681 45,606
Fair Value 48,218 42,373
Asset-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Other securities which provide for periodic payments, Amortized Cost 15,784 14,631
Other securities which provide for periodic payments, Fair Value 15,656 14,342
Amortized Cost 15,784 14,631
Fair Value 15,656 14,342
Commercial mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Other securities which provide for periodic payments, Amortized Cost 5,379 4,797
Other securities which provide for periodic payments, Fair Value 5,182 4,475
Amortized Cost 5,379 4,797
Fair Value 5,182 4,475
Residential mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Other securities which provide for periodic payments, Amortized Cost 2,869 2,507
Other securities which provide for periodic payments, Fair Value $ 2,796 $ 2,429