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Earnings Per Share (Summary of Computation of Basic and Diluted Earnings Per Share) (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Numerator:
Net income attributable to common shareholders	$ 458	$ 729	$ 106
Denominator:
Weighted-average common shares outstanding for basic earnings per share (in shares)	165,349,471	166,364,299	165,182,290
Weighted-average effect of dilutive securities:
Employee equity awards (in shares)	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 (in shares)	167,691,299	169,585,031	168,800,997
Basic and diluted earnings per share:
Basic earnings per share (in dollars per share)	$ 2.77	$ 4.38	$ 0.64
Diluted earnings per share (in dollars per share)	$ 2.73	$ 4.30	$ 0.63

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