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RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - MARKET RISK (Details) CAD in Millions	12 Months Ended
	Dec. 31, 2016 CAD item	Dec. 31, 2015 CAD
Fair Value Hedges
Outstanding fair value hedges | CAD	CAD 0	CAD 0
Maximum
RISK MANAGEMENT AND FINANCIAL INSTRUMENTS
Floating rate debt as a percentage of total debt outstanding	25.00%
Foreign exchange contracts | Minimum
RISK MANAGEMENT AND FINANCIAL INSTRUMENTS
Period to hedge a minimum level of foreign currency denominated earnings exposures	5 years
Interest rate contracts - short-term borrowings
RISK MANAGEMENT AND FINANCIAL INSTRUMENTS
Average swap rate (as a percent)	2.40%
Interest rate contracts - long-term debt
RISK MANAGEMENT AND FINANCIAL INSTRUMENTS
Average swap rate (as a percent)	3.70%
Equity contracts
RISK MANAGEMENT AND FINANCIAL INSTRUMENTS
Number of forms of stock-based compensation with equity price risk | item	1

X

- Definition

Represents the floating rate debt as a target percentage of the total debt outstanding.

+ References

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- Definition

Future period of time over which foreign currency denominated earnings exposures may be economically hedged.

+ References

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- Definition

Represents number of forms of stock-based compensation with equity price risk managed via equity derivatives.

+ References

No definition available.

+ Details

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- Definition

Average variable interest rate related to the group of interest rate derivatives.

+ References

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Net fair value of all derivative instruments designated as fair value hedging instruments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958

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