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Per Share Data | 3 Months Ended
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Mar. 31, 2018
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 March 31,
(In millions, except per share amounts) | 2018 |  |  | 2017 |
Net income before non-controlling interests | $ | 696 |  |  | $ | 578 |
Less: Net income attributable to non-controlling interests | 6 |  |  | 9 |
Net income attributable to the Company | $ | 690 |  |  | $ | 569 |
Basic weighted average common shares outstanding | 508 |  |  | 515 |
Dilutive effect of potentially issuable common shares | 6 |  |  | 7 |
Diluted weighted average common shares outstanding | 514 |  |  | 522 |
Average stock price used to calculate common stock equivalents | $ | 82.83 |  |  | $ | 71.32 |
There were 10.6 million and 12.8 million stock options outstanding as of March 31, 2018 and 2017, 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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