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EARNINGS PER COMMON SHARE | 3 Months Ended
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Mar. 31, 2018
Earnings Per Share [Abstract] |
EARNINGS PER COMMON SHARE | EARNINGS PER COMMON SHARE BASIC Earnings per common share is calculated by dividing earnings attributable to common shareholders by the weighted average number of common shares outstanding. The weighted average number of common shares outstanding has been reduced by our pro-rata weighted average interest in our own common shares of 13 million for the three months ended March 31, 2018 and 2017, resulting from our reciprocal investment in Noverco Inc. DILUTED The treasury stock method is used to determine the dilutive impact of stock options. This method assumes any proceeds from the exercise of stock options would be used to purchase common shares at the average market price during the period. Weighted average shares outstanding used to calculate basic and diluted earnings per share are as follows:
| Three months ended March 31,
| 2018 |  | 2017 |
(number of common shares in millions) |  |  |  |
Weighted average shares outstanding | 1,685 |  | 1,177 |
Effect of dilutive options | 4 |  | 10 |
Diluted weighted average shares outstanding | 1,689 |  | 1,187 |
For the three months ended March 31, 2018 and 2017, 29,882,142 and 13,545,193, respectively, of anti-dilutive stock options with a weighted average exercise price of $49.80 and $57.71, respectively, were excluded from the diluted earnings per common share calculation.

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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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