Loss Per Share - Computation of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Basic and diluted:
Net loss attributable to common shareholders		$ (63)	$ (28)	$ (95)	$ (48)
Denominator:
Basic: Weighted average number of shares outstanding		87,130	87,130	87,130	87,130
Diluted: Weighted-average number of shares outstanding, assuming dilution	[1]	87,130	87,130	87,130	87,130
Basic loss per share		$ (0.72)	$ (0.32)	$ (1.09)	$ (0.55)
Diluted loss per share		$ (0.72)	$ (0.32)	$ (1.09)	$ (0.55)

[1] Shares in the diluted EPS calculation represent basic shares due to the net loss. The shares excluded from the calculation were 598,568 for the three and six months ended June 30, 2018 and 2017 because they are anti-dilutive.