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PROPERTY, PLANT AND EQUIPMENT - Impairment of Assets and Contract Charges (Details) - CAD CAD in Millions	12 Months Ended
	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.

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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
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-URIDate 2017-03-09

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