Investments (Maturities of Fixed Maturity Securities) (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Available-for-sale Securities, Debt Maturities [Abstract]
Amortized Cost, Due in one year or less	$ 9,644
Amortized Cost, Due after one year through five years	48,922
Amortized Cost, Due after five years through ten years	51,837
Amortized Cost, Due after ten years	129,750
Amortized Cost, Structured Securities	60,218
Amortized Cost, net of ACL	300,371
Estimated Fair Value, Due in one year or less	9,677
Estimated Fair Value, Due after one year through five years	48,325
Estimated Fair Value, Due after five years through ten years	50,598
Estimated Fair Value, Due after ten years	116,473
Estimated Fair Value, Structured Securities	56,339
Estimated Fair Value of Fixed Maturity Securities AFS	$ 281,412	$ 276,780