Investments (Amortized Cost and Fair Value of Fixed Maturities by Contractual Maturities) (Details) - USD ($) $ in Millions	Mar. 31, 2024		Dec. 31, 2023
Available For Sale Securities Debt Maturities Amortized Cost
Due in one year or less	$ 1,316
Due after one year through five years	11,090
Due after five year through ten years	12,989
Due after ten years	37,006
Asset and mortgage-backed securities	8,389
Total	70,790		$ 64,977
Available For Sale Securities Debt Maturities Fair Value
Due in one year or less	1,313
Due after one year through five years	10,925
Due after five year through ten years	12,401
Due after ten years	33,232
Asset and mortgage-backed securities	7,956
Total	$ 65,827	[1]	$ 60,467	[2]

[1] Excludes limited partnerships that are measured at estimated fair value using the NAV per share (or its equivalent) as a practical expedient. As of March 31, 2024, the fair value of such investments was $893 million.

[2] Excludes limited partnerships that are measured at estimated fair value using the NAV per share (or its equivalent) as a practical expedient. As of December 31, 2023, the fair value of such investments was $856 million