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	$ 4,427	$ 4,442
Corporate Bonds [Member] | Fixed Maturity AFS Securities [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading securities	2,679	3,049
U.S. Government Bonds [Member] | Fixed Maturity AFS Securities [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading securities	32
State And Municipal Bonds [Member] | Fixed Maturity AFS Securities [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading securities	27	28
Foreign Government Bonds [Member] | Fixed Maturity AFS Securities [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading securities	73	92
RMBS [Member] | Fixed Maturity AFS Securities [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading securities	95	131
CMBS [Member] | Fixed Maturity AFS Securities [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading securities	137	134
ABS [Member] | Fixed Maturity AFS Securities [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading securities	1,338	966
Hybrid And Redeemable Preferred Securities [Member] | Fixed Maturity AFS Securities [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading securities	$ 46	$ 42