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Earnings Per Share (Tables) | 9 Months Ended
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Sep. 30, 2017
Earnings Per Share |
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

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- Definition Tabular disclosure of the weighted average number of shares used in calculating basic net earnings per share (or unit) and diluted earnings per share (or unit). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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