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INVESTMENTS - Narrative (Details) - CAD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2018
Investment in PrairieSky Royalty Ltd.
Disclosure of detailed information about financial instruments [line items]
Number of shares held as investment (in shares)		22.6
Investment in Inter Pipeline Ltd.
Disclosure of detailed information about financial instruments [line items]
Number of shares held as investment (in shares)		6.4
Disposal of Cold Lake Pipeline \| Investment in Inter Pipeline Ltd.
Disclosure of detailed information about financial instruments [line items]
Non-cash share consideration received	$ 190
Non-cash share consideration received (in shares)	6.4
Non-cash share consideration received, price per share (in CAD per share)	$ 29.57