Investments (Maturities of Fixed Maturity Securities) (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Available-for-sale Securities, Debt Maturities [Abstract]
Amortized Cost, Due in one year or less	$ 9,482
Amortized Cost, Due after one year through five years	50,121
Amortized Cost, Due after five years through ten years	53,087
Amortized Cost, Due after ten years	132,048
Amortized Cost, Structured Securities	61,261
Amortized Cost, net of ACL	305,999
Estimated Fair Value, Due in one year or less	9,521
Estimated Fair Value, Due after one year through five years	48,486
Estimated Fair Value, Due after five years through ten years	49,128
Estimated Fair Value, Due after ten years	108,555
Estimated Fair Value, Structured Securities	55,292
Estimated Fair Value of Fixed Maturity Securities AFS	$ 270,982	$ 276,780