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FINANCIAL INSTRUMENTS - Net (gains) losses from risk management activities (Details) - CAD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Financial Instruments [Abstract]
Net realized risk management (gain) loss	$ (99)	$ (2)	$ 8
Net unrealized risk management (gain) loss	(35)	37	25
Gains (losses) on change in fair value of derivatives	$ (134)	$ 35	$ 33

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- Definition

Financial Instruments [Abstract]

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No definition available.

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- Definition

Gain (Losses) On Change In Fair Value Of Settled Derivatives

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No definition available.

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- Definition

Gain (Losses) On Change In Fair Value Of Unsettled Derivatives

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No definition available.

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- Definition

The gains (losses) resulting from change in the fair value of derivatives recognised in profit or loss. [Refer: Derivatives [member]]

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
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-IssueDate 2018-01-01
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-URIDate 2018-03-16

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