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Earnings Per Share (Tables)

12 Months Ended

Dec. 31, 2018

Earnings Per Share [Abstract]

Summary of Computation of Basic and Diluted Earnings Per Share

The following table sets forth the computation of basic and diluted earnings per share:



	Year Ended December 31,
	2018				2017				2016
Numerator:	(in millions, except share and per share amounts)
Net income attributable to common shareholders	$	458			$	729			$	106
Denominator:
Weighted-average common shares outstanding for basic earnings per share	165,349,471				166,364,299				165,182,290
Weighted-average effect of dilutive securities:
Employee equity awards⁽¹⁾	1,988,610				2,861,892				3,258,136
Contingent issuance of common stock	353,218				358,840				360,571
Weighted-average common shares outstanding for diluted earnings per share	167,691,299				169,585,031				168,800,997
Basic and diluted earnings per share:
Basic earnings per share	$	2.77			$	4.38			$	0.64
Diluted earnings per share	$	2.73			$	4.30			$	0.63

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⁽¹⁾	PSUs, which are considered contingently issuable, are included in the computation of dilutive earnings per share on a weighted average basis when management determines the related performance criteria are met.