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SHARE CAPITAL - Stock Option Activity (Details) shares in Thousands | 12 Months Ended
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Dec. 31, 2017 CAD ($) shares | Dec. 31, 2016 CAD ($) shares
Share Capital, Reserves And Other Equity Interest [Abstract] |  |
Stock options outstanding - beginning of year (in shares) | shares | 58,299 | 74,615
Stock options granted (in shares) | shares | 16,052 | 11,002
Stock options surrendered for cash settlement (in shares) | shares | (626) | (817)
Stock options exercised for common shares (in shares) | shares | (14,256) | (16,284)
Stock options forfeited (in shares) | shares | (3,433) | (10,217)
Stock options outstanding - end of year (in shares) | shares | 56,036 | 58,299
Stock options exercisable (in shares) | shares | 18,282 | 20,747
Weighted average exercise price, options outstanding - beginning of year (in CAD per share) | $ | $ 34.22 | $ 34.88
Weighted average exercise price, options granted (in CAD per share) | $ | 42.07 | 34.97
Weighted average exercise price, options surrendered for cash settlement (in CAD per share) | $ | 33.18 | 34.47
Weighted average exercise price, options exercised (in CAD per share) | $ | 32.66 | 34.31
Weighted average exercise price, options forfeited (in CAD per share) | $ | 37.53 | 39.66
Weighted average exercise price, options outstanding - end of year (in CAD per share) | $ | 36.67 | 34.22
Weighted average exercise price, options exercisable (in CAD per share) | $ | $ 34.25 | $ 33.75

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- Definition The number of share options outstanding in a share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2017-01-01 -Paragraph 45 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_45_d&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2017-01-01 -Paragraph 45 -Subparagraph b -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_45_b_i&doctype=Standard -URIDate 2017-03-09 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2017-01-01 -Paragraph 45 -Subparagraph b -Clause vi -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_45_b_vi&doctype=Standard -URIDate 2017-03-09 + Details
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