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Per Share Data | 6 Months Ended
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Jun. 30, 2017
Earnings Per Share [Abstract] |
Per Share Data | Per Share Data Basic net income per share attributable to the Company is calculated by dividing the after-tax income attributable to the Company by the weighted average number of outstanding shares of the Company’s common stock. Diluted net income per share attributable to the Company is calculated by dividing the after-tax income attributable to the Company by the weighted average number of outstanding shares of the Company’s common stock, which have been adjusted for the dilutive effect of potentially issuable common shares.
Basic and Diluted EPS Calculation | Three Months Ended June 30, |  | Six Months Ended June 30,
(In millions, except per share amounts) | 2017 |  |  | 2016 |  |  | 2017 |  |  | 2016 |
Basic weighted average common shares outstanding | 514 |  |  | 521 |  |  | 514 |  |  | 521 |
Dilutive effect of potentially issuable common shares | 6 |  |  | 4 |  |  | 7 |  |  | 5 |
Diluted weighted average common shares outstanding | 520 |  |  | 525 |  |  | 521 |  |  | 526 |
Average stock price used to calculate common stock equivalents | $ | 75.41 |  |  | $ | 64.17 |  |  | $ | 73.36 |  |  | $ | 60.01 |
There were 12.4 million and 13.9 million stock options outstanding as of June 30, 2017 and 2016, respectively.

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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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