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Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2018
Earnings Per Share [Abstract] |
Schedule of Weighted Average Shares Outstanding Used to Compute Earnings Per Common Share | The weighted average number of shares outstanding used to compute earnings per common share were as follows (in millions):
|  | 2018 |  |  | 2017 |  |  | 2016 |
Weighted average common shares outstanding for basic computations |  | 284.5 |  |  | 287.8 |  |  | 299.3 |
Weighted average dilutive effect of equity awards |  | 2.3 |  |  | 2.8 |  |  | 3.8 |
Weighted average common shares outstanding for diluted computations |  | 286.8 |  |  | 290.6 |  |  | 303.1 |

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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://fasb.org/us-gaap/role/ref/legacyRef -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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