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EARNINGS PER COMMON SHARE - DILUTED (Details) - $ / shares | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Weighted average number of common shares outstanding diluted |  |
Weighted average common shares outstanding (in shares) | 1,685,000,000 | 1,177,000,000
Effect of dilutive options (in shares) | 4,000,000 | 10,000,000
Diluted weighted average common shares outstanding (in shares) | 1,689,000,000 | 1,187,000,000
Stock options |  |
Weighted average number of common shares outstanding diluted |  |
Antidilutive securities excluded from the diluted earnings per common share calculation (in shares) | 29,882,142 | 13,545,193
Weighted average exercise price of antidilutive securities (in Canadian dollars per share) | $ 49.80 | $ 57.71

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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- Definition The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=96947427&loc=d3e1505-109256 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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