Net Income Per Share Attributable To Common Stockholders (Tables)

12 Months Ended

Dec. 31, 2020

Earnings Per Share [Abstract]

Reconciliation of net income (loss) attributable to common stockholders, basic and diluted

The components of basic and diluted net income (loss) per share attributable to common stockholders are as follows:

	Year Ended December 31,
	2020		2019		2018
	(in millions)
Net income (loss) attributable to common stockholders	$	(200)	$	773	$	978
Participating share based earnings (a)	—		(3)		(5)
Basic and diluted net income (loss) attributable to common stockholders	$	(200)	$	770	$	973
Basic and diluted weighted average shares outstanding	165		167		171

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(a)Unvested restricted stock awards represent participating securities because they participate in nonforfeitable dividends with the common equity owners of the Company. Participating share- or unit-based earnings represent the distributed and undistributed earnings of the Company attributable to the participating securities. Unvested restricted stock awards do not participate in undistributed net losses as they are not contractually obligated to do so.