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PROPERTY, PLANT AND EQUIPMENT - Impairment of Assets and Contract Charges (Details) - CAD CAD in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Disclosure of impairment loss and reversal of impairment loss [line items] |  |
Total impairment of assets and related onerous contract charges | CAD 0 | CAD 484
Property, plant and equipment |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |
Total impairment of assets and related onerous contract charges | 412 |
Onerous contracts and other |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |
Total impairment of assets and related onerous contract charges | CAD 72 |

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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 impairment loss or reversal of impairment loss recognised in profit or loss. [Refer: Impairment loss recognised in profit or loss; Reversal of impairment loss recognised in profit or loss] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 99 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_99&doctype=Standard -URIDate 2017-03-09 + Details
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