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SHORT-TERM BORROWINGS - Short-term Borrowings (Details) - CAD CAD in Millions	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of detailed information about borrowings [line items]
Total short-term borrowings	CAD 1,585	CAD 800
Accounts receivable securitization program
Disclosure of detailed information about borrowings [line items]
Total short-term borrowings	CAD 650	CAD 800	CAD 800

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- Definition

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.

+ References

No definition available.

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- Definition

The amount of current borrowings. [Refer: Borrowings]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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