Net Income (Loss) Per Share (Tables)

3 Months Ended

Mar. 31, 2018

Earnings Per Share [Abstract]

Reconciliation of earnings attributable to common stockholders, basic and diluted

The following table reconciles the Company's net income (loss) attributable to common stockholders to basic and diluted net income (loss) attributable to common stockholders for the three months ended March 31, 2018 and 2017:

	Three Months Ended March 31,
	2018			2017
	(in millions)
Net income (loss) attributable to common stockholders	$	178		$	(42	)
Participating share-based earnings	(1		)	—
Basic and diluted net income (loss) attributable to common stockholders	$	177		$	(42	)

Schedule of Weighted Average Number of Shares [Table Text Block]

	Three Months Ended March 31,
	2018	2017
	(in millions)
Basic weighted average shares outstanding	170	170
Dilution attributable to stock-based compensation awards	1	—
Diluted weighted average shares outstanding	171	170