Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net (loss) income attributable to Successor/Predecessor	$ (186)
Less: Undistributed earnings attributable to participating stockholders	0
Net (loss) income attributable to common stockholders	$ (186)
Net (loss) income per common share attributable to Successor/Predecessor:
Basic (in dollars per share)	$ (2.05)
Diluted (in dollars per share)	$ (2.05)
Weighted average shares of common stock outstanding (in thousands):
Basic (in shares)	90,828
Dilutive effect of stock awards (in shares)	0
Dilutive effect of participating securities (in shares)	0
Diluted (in shares)	90,828
Predecessor
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net (loss) income attributable to Successor/Predecessor		$ 160
Less: Undistributed earnings attributable to participating stockholders		0
Net (loss) income attributable to common stockholders		$ 160
Net (loss) income per common share attributable to Successor/Predecessor:
Basic (in dollars per share)		$ 1.63
Diluted (in dollars per share)		$ 1.61
Weighted average shares of common stock outstanding (in thousands):
Basic (in shares)		97,873
Dilutive effect of stock awards (in shares)		1,238
Dilutive effect of participating securities (in shares)		0
Diluted (in shares)		99,111