Investments (Maturities of Fixed Maturity Securities) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Available-for-sale Securities, Debt Maturities [Abstract]
Amortized Cost, Due in one year or less	$ 7,513
Amortized Cost, Due after one year through five years	55,284
Amortized Cost, Due after five years through ten years	58,215
Amortized Cost, Due after ten years	130,406
Amortized Cost, Structured Securities	59,375
Amortized Cost, net of ACL	310,793
Estimated Fair Value, Due in one year or less	7,623
Estimated Fair Value, Due after one year through five years	57,395
Estimated Fair Value, Due after five years through ten years	63,550
Estimated Fair Value, Due after ten years	150,526
Estimated Fair Value, Structured Securities	61,180
Estimated Fair Value of Fixed Maturity Securities AFS	$ 340,274	$ 354,809