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SHARE CAPITAL AND SHARE-BASED PAYMENTS - Activity of Outstanding Units Other than Options (Details) - shares | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Deferred Share Units |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Outstanding, January 1 | 535,579,000 | 439,136,000
Granted (in units) | 73,184,000 | 96,443,000
Outstanding, December 31 | 608,763,000 | 535,579,000
Restricted Share Units |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Outstanding, January 1 | 704,055,000 | 640,077,000
Granted (in units) | 242,565,000 | 409,279,000
Redeemed / Settled (in units) | (313,003,000) | (244,982,000)
Forfeited (in units) | (92,611,000) | (100,319,000)
Outstanding, December 31 | 541,006,000 | 704,055,000
Performance Share Units |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Outstanding, January 1 | 524,550,000 | 413,150,000
Granted (in units) | 159,850,000 | 276,000,000
Redeemed / Settled (in units) | (190,000,000) | (125,950,000)
Forfeited (in units) | (102,968,000) | (38,650,000)
Outstanding, December 31 | 391,432,000 | 524,550,000

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- Definition The number of other equity instruments (ie other than share options) granted 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 47 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_47_b&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 2 -IssueDate 2017-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_45&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The number of other equity instruments (ie other than share options) exercised or vested in a share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 2 -IssueDate 2017-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_45&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The number of other equity instruments (ie other than share options) forfeited in a share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 2 -IssueDate 2017-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_45&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The number of other equity instruments (ie other than share options) outstanding in a share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 2 -IssueDate 2017-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_45&doctype=Standard -URIDate 2017-03-09 + Details
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