Property, Plant and Equipment - Asset Retirement Obligations (Details) - USD ($) $ in Millions	2 Months Ended	10 Months Ended	12 Months Ended
	Dec. 31, 2017	Oct. 31, 2017	Dec. 31, 2018	Dec. 31, 2016
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Balance at beginning of period	$ 45		$ 45
Accretion expense	1		5
Purchase price adjustments	0		58
Liabilities settled	(1)		(13)
Revision in estimated cash flows	0		10
Effect of foreign currency rate change	0		0
Balance at end of period	45	$ 45	$ 105
Predecessor
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Balance at beginning of period	$ 94	89		$ 90
Accretion expense		12		10
Purchase price adjustments		0		0
Liabilities settled		(7)		(9)
Revision in estimated cash flows		0		0
Effect of foreign currency rate change		0		(2)
Balance at end of period		$ 94		$ 89