Investments (Amortized Cost and Fair Value of Fixed Maturities by Contractual Maturities) (Details) - USD ($) $ in Millions	Sep. 30, 2023		Dec. 31, 2022
Available For Sale Securities Debt Maturities Amortized Cost
Due in one year or less	$ 1,623
Due after one year through five years	10,151
Due after five year through ten years	11,183
Due after ten years	31,682
Asset and mortgage-backed securities	7,693
Total	62,332		$ 59,663
Available For Sale Securities Debt Maturities Fair Value
Due in one year or less	1,628
Due after one year through five years	9,779
Due after five year through ten years	9,987
Due after ten years	25,801
Asset and mortgage-backed securities	6,976
Total	$ 54,171	[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 September 30, 2023, the fair value of such investments was $818 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