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	$ 3,446	$ 3,527	$ 3,760	$ 4,313	$ 4,405	$ 4,114	$ 4,154	$ 4,287
Fixed Maturity AFS Securities [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading securities	3,446				4,405
Corporate Bonds [Member] | Fixed Maturity AFS Securities [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading securities	2,196				2,679
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	21				27
Foreign Government Bonds [Member] | Fixed Maturity AFS Securities [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading securities	49				73
RMBS [Member] | Fixed Maturity AFS Securities [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading securities	99				95
CMBS [Member] | Fixed Maturity AFS Securities [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading securities	137				137
ABS [Member] | Fixed Maturity AFS Securities [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading securities	919				1,338
Hybrid And Redeemable Preferred Securities [Member] | Fixed Maturity AFS Securities [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading securities	$ 25				$ 24