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Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2017
Earnings Per Share [Abstract] |
Average Common Shares Outstanding Basic and Diluted | The average number of common shares outstanding is reconciled to those used in the basic and diluted EPS computations as follows:
(Millions of shares) |  | 2017 |  | 2016 |  | 2015
Basic |  | 353.6 |  |  | 359.4 |  |  | 363.8 |
Dilutive effect of stock options and restricted share unit awards |  | 2.3 |  |  | 2.3 |  |  | 2.5 |
Diluted |  | 355.9 |  |  | 361.7 |  |  | 366.3 |

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