Investments (Amortized Cost and Fair Value of Fixed Maturities by Contractual Maturities) (Details) - USD ($) $ in Millions	Mar. 31, 2023		Dec. 31, 2022
Available For Sale Securities Debt Maturities Amortized Cost
Due in one year or less	$ 1,899
Due after one year through five years	10,092
Due after five year through ten years	11,375
Due after ten years	30,656
Asset and mortgage-backed securities	7,472
Total	61,494		$ 59,663
Available For Sale Securities Debt Maturities Fair Value
Due in one year or less	1,849
Due after one year through five years	9,879
Due after five year through ten years	10,513
Due after ten years	27,047
Asset and mortgage-backed securities	6,797
Total	$ 56,085	[1]	$ 52,901	[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, 2023, the fair value of such investments was $726 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, 2022, the fair value of such investments was $683 million