Income Taxes - Income Tax (Provision) Benefit Attributable To Income From Continuing Operations (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Current:
U.S. federal	$ (1)	$ 12	$ 8
U.S. state	(44)	(3)	(3)
Current income tax benefit (provision)	(45)	9	5
Deferred:
U.S. federal	(585)	55	(228)
U.S. state	2	(3)	(12)
Deferred income tax benefit (provision)	(583)	52	(240)
Income tax benefit (provision)	$ (628)	$ 61	$ (235)