Investments (Maturities of Fixed Maturity Securities) (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Available-for-sale Securities, Debt Maturities [Abstract]
Amortized Cost, Due in one year or less	$ 11,313
Amortized Cost, Due after one year through five years	48,735
Amortized Cost, Due after five years through ten years	54,449
Amortized Cost, Due after ten years	130,094
Amortized Cost, Structured Securities	64,653
Amortized Cost, net of ACL	309,244
Estimated Fair Value, Due in one year or less	11,361
Estimated Fair Value, Due after one year through five years	48,895
Estimated Fair Value, Due after five years through ten years	54,079
Estimated Fair Value, Due after ten years	116,874
Estimated Fair Value, Structured Securities	62,570
Estimated Fair Value of Fixed Maturity Securities AFS	$ 293,779	$ 281,412