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Income Tax Provision (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2019	Sep. 30, 2019	Dec. 31, 2019		Dec. 31, 2018		Dec. 31, 2017
Current:
Federal			$ 3		$ (11)		$ (8)
State			7		5		4
Foreign			2		2		2
Current Income Tax Expense (Benefit)			12		(4)		(2)
Deferred:
Federal			(25)		61		(73)
State			(9)		10		9
Foreign			0		0		0
Deferred Income Tax Expense (Benefit)		$ (29)	(34)		71		(64)
Income tax (benefit) expense from continuing operations	$ (23)	$ (22)	$ (22)	[1]	$ 67	[1]	$ (66)	[1]
Federal statutory rate			21.00%		21.00%		35.00%
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount							$ (184)
Unrecognized Tax Benefits, Period Increase (Decrease)							$ (32)
[1] Income tax benefit for the year ended December 31, 2017 reflects the impact of the 2017 Tax Act.

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