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Earnings Per Share (Summary of Computation of Basic and Diluted Earnings Per Share) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Numerator:
Net income attributable to common shareholders	$ 163	$ 170	$ 502	$ 483
Denominator:
Weighted-average common shares outstanding for basic earnings per share (in shares)	164,227,243	166,694,755	165,622,428	166,195,433
Weighted-average effect of dilutive securities:
Employee equity awards (in shares)	2,071,426	2,315,145	1,931,307	3,036,349
Contingent issuance of common stock	992,247	992,247	330,749	334,384
Weighted-average common shares outstanding for diluted earnings per share (in shares)	167,290,916	170,002,147	167,884,484	169,566,166
Basic and diluted earnings per share:
Basic earnings per share (in dollars per share)	$ 0.99	$ 1.02	$ 3.03	$ 2.91
Diluted earnings per share (in dollars per share)	$ 0.97	$ 1.00	$ 2.99	$ 2.85

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