FINANCE COSTS (Details) - CAD CAD in Millions	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016
Finance Costs [Abstract]
Interest on borrowings 1	CAD 740	CAD 758
Interest on post-employment benefits liability	12	9
(Gain) loss on foreign exchange	(107)	13
Change in fair value of derivative instruments	99	(16)
Capitalized interest	(18)	(18)
Other	20	15
Total finance costs	CAD 746	CAD 761

The amount of costs associated with financing activities of the entity.

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

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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The amount of exchange differences recognised in profit or loss that arise from foreign currency transactions, excluding those arising on financial instruments measured at fair value through profit or loss in accordance with IFRS 9. [Refer: At fair value [member]; Financial instruments, class [member]]

+ References

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The amount of interest costs that an entity incurs in connection with the borrowing of funds that are directly attributable to the acquisition, construction or production of a qualifying asset and which form part of the cost of that asset.

+ References

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The amount of interest expense on borrowings. [Refer: Interest expense; Borrowings]

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The amount of finance costs that the entity does not separately disclose in the same statement or note. [Refer: Finance costs]

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Finance Costs [Abstract]

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Interest Expense On Post-Employment Benefits Liability

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