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OTHER LONG-TERM LIABILITIES - Schedule of other long-term liabilities (Details) $ in Millions, $ in Millions | Dec. 31, 2017 USD ($) | Dec. 31, 2017 CAD ($) | Dec. 31, 2016 CAD ($) | Dec. 31, 2015 CAD ($) | Dec. 31, 2014 CAD ($)
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Disclosure Of Other Non-Current Liabilities [Line Items] |  |  |  |  |
Asset retirement obligations |  | $ 4,327 | $ 3,243 | $ 2,950 | $ 4,221
Share-based compensation |  | 414 | 426 | $ 128 | $ 203
Risk management (note 18) |  | 103 | 0 |  |
Other |  | 565 | 17 |  |
Other liabilities |  | 5,409 | 3,686 |  |
Current portion of other long-term liabilities |  | 1,012 | 463 |  |
Other long-term liabilities |  | 4,397 | $ 3,223 |  |
AOSP |  |  |  |  |
Disclosure Of Other Non-Current Liabilities [Line Items] |  |  |  |  |
Deferred purchase consideration payable | $ 375 | $ 469 |  |  |

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- Definition The amount of financial liabilities classified as derivative instruments. [Refer: Financial assets; Derivatives [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_55&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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