Net Income Per Share Attributable To Common Stockholders (Tables)

12 Months Ended

Dec. 31, 2019

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

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


	Year Ended December 31,
	2019		2018		2017
	(in millions)
Net income attributable to common stockholders	$	756	$	978	$	833
Participating share based earnings (a)	(3)		(5)		(6)
Basic and diluted net income attributable to common stockholders	$	753	$	973	$	827

Basic and diluted weighted average shares outstanding	167		171		170

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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.

Shares Repurchased

Shares repurchased are as follows:


	Year Ended December 31,
	2019		2018 (a)		2017
	(in millions)
Shares repurchased	$	622	$	149	$	—

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(a)During 2018, the Company repurchased $22 million of common stock pursuant to a previously authorized common stock repurchase program and $127 million of common stock pursuant to the current authorized common stock repurchase program.