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Earnings Per Common Share (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Numerator (basic and diluted):
Income from continuing operations	$ 140	$ 109
Less: Allocation to unvested restricted stock awards	1	1
Net income available to common shareholders	$ 139	$ 108
Denominator:
Basic common shares (based upon weighted average) (in shares)	317	330
Add: Stock option dilution (in shares)	4	3
Diluted common shares (in shares)	321	333

X

- Definition

Amount after tax of income (loss) from continuing operations attributable to the parent.

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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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Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period).

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Amount of undistributed earnings (loss) allocated to participating securities for the basic earnings (loss) per share or per unit calculation under the two-class method.

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