Investments (Maturities of Fixed Maturity Securities) (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Available-for-sale Securities, Debt Maturities [Abstract]
Amortized Cost, Due in one year or less	$ 8,637
Amortized Cost, Due after one year through five years	51,765
Amortized Cost, Due after five years through ten years	52,278
Amortized Cost, Due after ten years	133,148
Amortized Cost, Structured Securities	61,020
Amortized Cost, net of ACL	306,848
Estimated Fair Value, Due in one year or less	8,661
Estimated Fair Value, Due after one year through five years	50,394
Estimated Fair Value, Due after five years through ten years	49,710
Estimated Fair Value, Due after ten years	118,895
Estimated Fair Value, Structured Securities	56,197
Estimated Fair Value of Fixed Maturity Securities AFS	$ 283,857	$ 276,780