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STOCK-BASED COMPENSATION - Summary of Stock-based Compensation Expense (Details) - CAD CAD in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Total stock-based compensation expense | CAD 61 | CAD 61
Stock options |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Total stock-based compensation expense | 33 | 17
Restricted share units |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Total stock-based compensation expense | 51 | 45
Deferred share units |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Total stock-based compensation expense | 51 | 32
Equity derivative effect, net of interest receipt |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Total stock-based compensation expense | CAD (74) | CAD (33)

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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- Definition The amount of expense from share-based payment transactions with employees. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_112_c&doctype=Standard -URIDate 2017-03-09 + Details
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