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Income Per Common Share (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Numerator (basic and diluted):
Net income	$ 180	$ 152	$ 540	$ 453
Less: Allocation to unvested restricted stock awards	1	1	5	4
Net income available to common shareholders	$ 179	$ 151	$ 535	$ 449
Denominator:
Basic common shares (based upon weighted average) (in shares)	304	313	307	315
Add: Stock option dilution (in shares)	2	3	2	4
Diluted common shares (in shares)	306	316	309	319

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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Amount, after deduction of tax, noncontrolling interests, dividends on preferred stock and participating securities; of income (loss) available to common shareholders.

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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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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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