Investments (Amortized Cost and Fair Value of Fixed Maturities by Contractual Maturities) (Details) - USD ($) $ in Millions	Jun. 30, 2023		Dec. 31, 2022
Available For Sale Securities Debt Maturities Amortized Cost
Due in one year or less	$ 1,883
Due after one year through five years	10,281
Due after five year through ten years	11,237
Due after ten years	31,197
Asset and mortgage-backed securities	7,587
Total	62,185		$ 59,663
Available For Sale Securities Debt Maturities Fair Value
Due in one year or less	1,887
Due after one year through five years	9,970
Due after five year through ten years	10,257
Due after ten years	27,221
Asset and mortgage-backed securities	6,901
Total	$ 56,236	[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 June 30, 2023, the fair value of such investments was $768 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