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Earnings Per Share - Schedule of Computations of Weighted Average Shares Outstanding (Detail) - shares shares in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Earnings Per Share [Abstract]
Weighted-average shares outstanding	489.6	482.3	485.2	396.9
Share-based payment awards classified as participating securities	0.8	1.7	1.1	1.4
Basic weighted-average shares outstanding	490.4	484.0	486.3	398.3
Dilutive securities	1.1	2.2	1.6	1.8
Diluted weighted-average shares outstanding	491.5	486.2	487.9	400.1

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- Definition

This element represents the weighted average shares outstanding throughout the period including the first (beginning balance outstanding) and last (ending balance outstanding) day of the period.

+ References

No definition available.

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- Definition

This element represents nonvested share-based payment awards that contain non-forfeitable rights to dividends or dividend equivalents (whether paid or unpaid). Basic and dilutive earnings per share are generally disclosed for such shares using the two-class method.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 45
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- Definition

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 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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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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