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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
	Mar. 31, 2017	Mar. 31, 2016
Earnings Per Share [Abstract]
Net income attributable to common shareholders	$ 169	$ 132
Weighted-average common shares outstanding for basic earnings per share (in shares)	166,473,073	164,281,692
Employee equity awards (in shares)	3,773,874	4,086,752
Weighted-average common shares outstanding for diluted earnings per share (in shares)	170,246,947	168,368,444
Basic earnings per share (in dollars per share)	$ 1.02	$ 0.80
Diluted earnings per share (in dollars per share)	$ 0.99	$ 0.78

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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