OTHER (INCOME) EXPENSE (Details) - CAD CAD in Millions	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016
Analysis of income and expense [abstract]
(Income) losses from associates and joint ventures	CAD (14)	CAD 216
Net loss on divestitures pertaining to investments	0	11
Other investment income	(5)	(36)
Total other (income) expense	(19)	191
Adjustments for gain (loss) on disposal of investments in subsidiaries, joint ventures and associates	CAD 20	CAD (140)

Adjustments for gain (loss) on disposals investments in subsidiaries, joint ventures and associates to reconcile profit (loss) to net cash flow from (used in) operating activities. [Refer: Associates [member]; Joint ventures [member]; Subsidiaries [member]; Investments in subsidiaries, joint ventures and associates; Profit (loss)]

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Adjustments for undistributed profits of investments accounted for using the equity method to reconcile profit (loss) to net cash flow from (used in) operating activities. [Refer: Investments accounted for using equity method; Profit (loss)]

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The amount of investment income, such as interest and dividends.

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The amount of expenses that the entity does not separately disclose in the same statement or note when the entity uses the 'nature of expense' form for its analysis of expenses. [Refer: Expenses, by nature]

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The entity's share of the profit (loss) of associates and joint ventures accounted for using the equity method. [Refer: Associates [member]; Investments accounted for using equity method; Joint ventures [member]; Profit (loss)]

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