Investments (Maturities of Fixed Maturity Securities) (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Available-for-sale Securities, Debt Maturities [Abstract]
Amortized Cost, Due in one year or less	$ 8,804
Amortized Cost, Due after one year through five years	53,049
Amortized Cost, Due after five years through ten years	57,391
Amortized Cost, Due after ten years	132,101
Amortized Cost, Structured Securities	62,172
Amortized Cost, net of ACL	313,517
Estimated Fair Value, Due in one year or less	8,866
Estimated Fair Value, Due after one year through five years	53,469
Estimated Fair Value, Due after five years through ten years	58,818
Estimated Fair Value, Due after ten years	137,686
Estimated Fair Value, Structured Securities	61,240
Estimated Fair Value of Fixed Maturity Securities AFS	$ 320,079	$ 340,274