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OTHER LONG-TERM LIABILITIES - Share-Based Compensation (Details) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Reconciliation Of Changes In Liabilities From Share-Based Payment Transactions [Roll Forward] |  |  |
Balance – beginning of year | $ 426 | $ 128 | $ 203
Share-based compensation expense (recovery) | 134 | 355 | (46)
Cash payment for stock options surrendered | (6) | (7) | (1)
Transferred to common shares | (154) | (117) | (18)
Charged to (recovered from) Oil Sands Mining and Upgrading, net | 14 | 67 | (10)
Balance – end of year | 414 | 426 | 128
Less: current portion | 348 | 368 | 105
Non-current liabilities from share-based payment arrangements | 66 | 58 | 23
Performance Share Units |  |  |
Reconciliation Of Changes In Liabilities From Share-Based Payment Transactions [Roll Forward] |  |  |
Share-based compensation expense (recovery) | $ 5 | $ 0 | $ 0

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- Definition Current Liabilities From Share-Based Payment Arrangements + References No definition available. + Details
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- Definition Liabilities From Share-Based Payment Transactions, Charged to (Recovered From) Segment + References No definition available. + Details
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- Definition Liabilities From Share-Based Payment Transactions, Transferred To Common Shares Through Exercise Of Options + References No definition available. + Details
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- Definition Non-Current Liabilities From Share-Based Payment Transactions + References No definition available. + Details
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- Definition Reconciliation Of Changes In Liabilities From Share-Based Payment Transactions [Roll Forward] + 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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- Definition The amount of liabilities arising from share-based payment transactions. Share-based payment transactions are transactions in which the entity: (a) receives goods or services from the supplier of those goods or services (including an employee) in a share-based payment arrangement; or (b) incurs an obligation to settle the transaction with the supplier in a share-based payment arrangement when another group entity receives those goods or services. [Refer: Share-based payment arrangements [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2017-01-01 -Paragraph 51 -Subparagraph b -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_51_b_i&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The cash outflow for payments for equity instruments that the entity does not separately disclose in the same statement or note. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 7 -IssueDate 2017-01-01 -Paragraph 17 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2017-03-01&anchor=para_17&doctype=Standard -URIDate 2017-03-09 + Details
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- Details
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