Investments (Maturities of Fixed Maturity Securities) (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Available-for-sale Securities, Debt Maturities [Abstract]
Amortized Cost, Due in one year or less	$ 8,215
Amortized Cost, Due after one year through five years	52,504
Amortized Cost, Due after five years through ten years	52,792
Amortized Cost, Due after ten years	133,236
Amortized Cost, Structured Securities	58,022
Amortized Cost, net of ACL	304,769
Estimated Fair Value, Due in one year or less	8,174
Estimated Fair Value, Due after one year through five years	51,410
Estimated Fair Value, Due after five years through ten years	50,416
Estimated Fair Value, Due after ten years	120,353
Estimated Fair Value, Structured Securities	53,501
Estimated Fair Value of Fixed Maturity Securities AFS	$ 283,854	$ 276,780