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FINANCIAL INSTRUMENTS - Net (gains) losses from risk management activities (Details) - CAD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Financial Instruments [Abstract]
Net realized risk management (gain) loss	$ (2)	$ 8	$ (843)
Net unrealized risk management loss	37	25	374
Gains (losses) on change in fair value of derivatives	$ (35)	(33)	469
Gains (losses) on change in fair value of derivatives		$ (33)	$ 469

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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 Derivatives Not Designated As Hedging Instruments And Gain (Loss) On Hedge Ineffectiveness

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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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- 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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