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Earnings Per Share, ASU 2016-09 (Details) - shares shares in Millions | 3 Months Ended | 9 Months Ended
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Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Effect of dilutive stock options |  |  |  |
Effect of dilutive stock options (in shares) | 10.7 | 6.8 | 10.3 | 6.8
Impact of ASU 2016-09 |  |  |  |
Effect of dilutive stock options |  |  |  |
Effect of dilutive stock options (in shares) | 2.0 |  | 2.0 |

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