Investments (Maturities of Fixed Maturity Securities) (Details) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
Available-for-sale Securities, Debt Maturities [Abstract]
Amortized Cost, Due in one year or less	$ 11,450
Amortized Cost, Due after one year through five years	48,991
Amortized Cost, Due after five years through ten years	52,138
Amortized Cost, Due after ten years	126,778
Amortized Cost, Structured Securities	63,713
Amortized Cost, net of ACL	303,070
Estimated Fair Value, Due in one year or less	11,484
Estimated Fair Value, Due after one year through five years	48,300
Estimated Fair Value, Due after five years through ten years	49,969
Estimated Fair Value, Due after ten years	108,106
Estimated Fair Value, Structured Securities	59,877
Estimated Fair Value of Fixed Maturity Securities AFS	$ 277,736	$ 281,412