Income Tax (Provision for Income Tax) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Current federal	$ 5	$ 0	$ (35)
Deferred federal	(76)	(433)	(303)
Provision for income tax expense (benefit)	$ (71)	$ (433)	$ (338)