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Investments - Amortized Cost and Fair Value of Fixed Maturity Available-for-Sale Securities (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]    
Due in one year or less, Amortized Cost $ 426 $ 466
Due after one year through five years, Amortized Cost 2,998 2,171
Due after five years through ten years, Amortized Cost 2,389 2,116
Due after ten years, Amortized Cost 12,930 11,560
Subtotal, Amortized Cost 18,743 16,313
Other securities which provide for periodic payments, Amortized Cost 11,962 9,264
Amortized Cost 30,705 25,577
Due in one year or less, Fair Value 431 463
Due after one year through five years, Fair Value 3,051 2,295
Due after five years through ten years, Fair Value 2,458 2,255
Due after ten years, Fair Value 13,608 12,624
Subtotal, Fair Value 19,548 17,637
Other securities which provide for periodic payments, Fair Value 12,442 9,950
Total fixed maturity available-for-sale securities, Fair Value 31,990 27,587
Asset-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Other securities which provide for periodic payments, Amortized Cost 8,516 5,941
Amortized Cost 8,516 5,941
Other securities which provide for periodic payments, Fair Value 8,695 6,266
Commercial mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Other securities which provide for periodic payments, Amortized Cost 2,684 2,490
Amortized Cost 2,684 2,490
Other securities which provide for periodic payments, Fair Value 2,979 2,829
Structured hybrids    
Debt Securities, Available-for-sale [Line Items]    
Other securities which provide for periodic payments, Amortized Cost 31 27
Other securities which provide for periodic payments, Fair Value 37 30
Residential mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Other securities which provide for periodic payments, Amortized Cost 731 806
Other securities which provide for periodic payments, Fair Value $ 731 $ 825