Investments (Maturities of Fixed Maturity Securities) (Details) - USD ($) $ in Millions	Jun. 30, 2025	Dec. 31, 2024
Available-for-sale Securities, Debt Maturities [Abstract]
Amortized Cost, Due in one year or less	$ 13,174
Amortized Cost, Due after one year through five years	48,581
Amortized Cost, Due after five years through ten years	53,881
Amortized Cost, Due after ten years	131,559
Amortized Cost, Structured Securities	74,389
Amortized Cost, net of ACL	321,584
Estimated Fair Value, Due in one year or less	13,291
Estimated Fair Value, Due after one year through five years	49,010
Estimated Fair Value, Due after five years through ten years	53,426
Estimated Fair Value, Due after ten years	111,094
Estimated Fair Value, Structured Securities	71,916
Estimated Fair Value of Fixed Maturity Securities AFS	$ 298,737	$ 281,043