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Earnings Per Share | 6 Months Ended
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Jun. 30, 2017
Earnings Per Share [Abstract] |
Earnings Per Share |
5. | Earnings Per Share
Basic and diluted earnings per share were computed using the following common share data (shares in millions):
|  | Three Months Ended June 30, |  |  | Six Months Ended June 30, |
|  | 2017 |  |  | 2016 |  |  | 2017 |  |  | 2016 |
Number of common shares outstanding at end of period |  |  | 439.7 |  |  |  | 441.7 |  |  |  | 439.7 |  |  |  | 441.7 |
Effect of using weighted average common shares outstanding |  |  | 2.2 |  |  |  | 2.3 |  |  |  | 1.9 |  |  |  | 3.3 |
Weighted average basic common shares outstanding |  |  | 441.9 |  |  |  | 444.0 |  |  |  | 441.6 |  |  |  | 445.0 |
Dilutive effect of equity-based compensation awards and other contingently issuable shares(a) |  |  | 2.5 |  |  |  | 2.7 |  |  |  | 2.8 |  |  |  | 2.5 |
Weighted average diluted common shares outstanding |  |  | 444.4 |  |  |  | 446.7 |  |  |  | 444.4 |  |  |  | 447.5 |
Potentially issuable shares |  |  | 8.4 |  |  |  | 10.1 |  |  |  | 8.4 |  |  |  | 10.1 |
Number of anti-dilutive potentially issuable shares excluded from diluted common shares outstanding |  |  | 2.3 |  |  |  | 0.5 |  |  |  | 2.3 |  |  |  | 0.8 |
(a) | 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 The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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