Income Tax Provision (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Current:
Federal	$ (5)	$ 3	$ (13)
State	13	7	5
Foreign	2	1	2
Current Income Tax Expense (Benefit)	10	11	(6)
Deferred:
Federal	(66)	4	62
State	(48)	(1)	9
Foreign	0	0	0
Deferred Income Tax Expense (Benefit)	(114)	3	71
Income tax (benefit) expense	$ (104)	$ 14	$ 65

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