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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, 2018 | Dec. 31, 2017
Deferred Share Units |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Outstanding, January 1 | 608,763,000 | 535,579,000
Granted (in units) | 107,318,000 | 73,184,000
Redeemed / Settled (in units) | (182,383,000) | 0
Outstanding, December 31 | 533,698,000 | 608,763,000
Restricted Share Units |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Outstanding, January 1 | 541,006,000 | 704,055,000
Granted (in units) | 322,935,000 | 242,565,000
Redeemed / Settled (in units) | (276,983,000) | (313,003,000)
Forfeited (in units) | (161,863,000) | (92,611,000)
Outstanding, December 31 | 425,095,000 | 541,006,000
Performance Share Units |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Outstanding, January 1 | 391,432,000 | 524,550,000
Granted (in units) | 174,900,000 | 159,850,000
Redeemed / Settled (in units) | (255,232,000) | (190,000,000)
Forfeited (in units) | 0 | (102,968,000)
Outstanding, December 31 | 311,100,000 | 391,432,000

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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 2018-01-01 -Paragraph 47 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2018-03-01&anchor=para_47_b&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 2 -IssueDate 2018-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2018-03-01&anchor=para_45&doctype=Standard -URIDate 2018-03-16 + 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 2018-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2018-03-01&anchor=para_45&doctype=Standard -URIDate 2018-03-16 + 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 2018-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2018-03-01&anchor=para_45&doctype=Standard -URIDate 2018-03-16 + Details
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