Earnings Per Share (Tables)

9 Months Ended

Sep. 30, 2017

Common Share Data Used for Computing Basic and Diluted Earnings Per Share

Basic and diluted earnings per share were computed using the following common share data (shares in millions):


	Three Months Ended		Nine Months Ended
	September 30,		September 30,
	2017	2016	2017	2016
Number of common shares outstanding at end of period	434.2	442.0	434.2	442.0
Effect of using weighted average common shares outstanding	3.6	0.9	6.1	2.3
Weighted average basic common shares outstanding	437.8	442.9	440.3	444.3
Dilutive effect of equity-based compensation awards and other contingently issuable shares (a)	3.0	2.8	3.0	2.8
Weighted average diluted common shares outstanding	440.8	445.7	443.3	447.1
Potentially issuable shares	8.2	9.2	8.2	9.2
Number of anti-dilutive potentially issuable shares excluded from diluted common shares outstanding	1.9	0.5	2.3	0.5

As of January 1, 2017, we adopted ASU 2016‑09 prospectively and no longer include excess tax benefits as assumed proceeds. See Note 1 for further discussion