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Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2016
Earnings Per Share [Abstract] |
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 for the years ended December 31 (shares in millions):
|  | 2016 |  |  | 2015 |  |  | 2014 |
Number of common shares outstanding at year-end |  |  | 439.3 |  |  |  | 447.2 |  |  |  | 458.5 |
Effect of using weighted average common shares outstanding |  |  | 4.2 |  |  |  | 5.5 |  |  |  | 4.1 |
Weighted average basic common shares outstanding |  |  | 443.5 |  |  |  | 452.7 |  |  |  | 462.6 |
Dilutive effect of equity-based compensation awards and other contingently issuable shares |  |  | 3.0 |  |  |  | 3.2 |  |  |  | 3.0 |
Weighted average diluted common shares outstanding |  |  | 446.5 |  |  |  | 455.9 |  |  |  | 465.6 |
Potentially issuable shares |  |  | 9.8 |  |  |  | 10.2 |  |  |  | 11.3 |
Number of anti-dilutive potentially issuable shares excluded from diluted common shares outstanding |  |  | 1.0 |  |  |  | 2.0 |  |  |  | 0.4 |

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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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