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INVESTMENTS - Inter Pipeline (Details) - CAD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of financial assets [line items]
(Gain) loss from investment	$ 346	$ (38)	$ (327)
Investment in Inter Pipeline Ltd.
Disclosure of financial assets [line items]
Fair value loss from Inter Pipeline	43	23	0
Dividend income from Inter Pipeline	(11)	(10)	(1)
(Gain) loss from investment	$ 32	$ 13	$ (1)

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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.

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- Definition

The gains (losses) on financial assets at fair value through profit or loss. [Refer: Financial assets at fair value through profit or loss]

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

The amount of dividends recognised as income. Dividends are distributions of profits to holders of equity investments in proportion to their holdings of a particular class of capital.

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