Investments (Fair Value of Trading Securities) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading securities	$ 3,498	$ 3,580	$ 3,803	$ 4,364	$ 4,460	$ 4,170	$ 4,211	$ 4,344
Corporate Bonds [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading securities	2,248				2,734
U.S. Government Bonds [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading securities					32
Foreign Government Bonds [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading securities	49				73
RMBS [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading securities	99				95
CMBS [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading securities	137				137
ABS [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading securities	919				1,338
State And Municipal Bonds [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading securities	21				27
Hybrid And Redeemable Preferred Securities [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading securities	$ 25				$ 24