Investments (Fair Value of Trading Securities) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading securities	$ 4,482	$ 4,501
Corporate Bonds [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading securities	2,734	3,107
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	73	92
RMBS [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading securities	95	132
CMBS [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading securities	137	134
ABS [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading securities	1,338	966
State And Municipal Bonds [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading securities	27	28
Hybrid And Redeemable Preferred Securities [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading securities	$ 46	$ 42