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SHORT-TERM BORROWINGS - Movement in Borrowing Programs (Details) CAD in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2017 CAD | Dec. 31, 2017 USD ($) | Dec. 31, 2016 CAD
Disclosure of detailed information about borrowings [line items] |  |  |
Short-term borrowings, beginning balance | CAD 800 |  |
Net proceeds (repayments) from current borrowings | 858 |  | CAD 0
Gain on foreign exchange | 107 |  | (13)
Short-term borrowings, ending balance | 1,585 |  | 800
Accounts receivable securitization program |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Short-term borrowings, beginning balance | 800 |  | 800
Net proceeds (repayments) from current borrowings | (150) |  | 0
Short-term borrowings, ending balance | 650 |  | 800
US commercial paper |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Short-term borrowings, beginning balance | CAD 0 | $ 0 |
Exchange rate on current borrowings | 0.00 | 0.00 |
Net proceeds (repayments) from current borrowings | CAD 1,008 | $ 737 | CAD 0
Exchange rate on proceeds from current borrowings, net | 1.37 | 1.37 |
Discount on issuance | CAD 12 | $ 9 |
Exchange rate on discounts on issuance of current borrowings | 1.33 | 1.33 |
Gain on foreign exchange | CAD (85) |  |
Exchange rate on current borrowings | 1.25 | 1.25 | 0.00
Short-term borrowings, ending balance | CAD 935 | $ 746 | CAD 0

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- Definition The cash inflow (outflow) due to a decrease (increase) in current borrowings. [Refer: Current borrowings] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 7 -IssueDate 2017-01-01 -Paragraph 17 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2017-03-01&anchor=para_17&doctype=Standard -URIDate 2017-03-09 + Details
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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. + Details
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- Definition 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 Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 7 -IssueDate 2017-01-01 -Section A Statement of cash flows for an entity other than a financial institution -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2017-03-01&anchor=sect_AStatementofcashflowsforanentityotherthanafinancialinstitution&doctype=Illustrative%20Examples -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 21 -IssueDate 2017-01-01 -Paragraph 52 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=21&date=2017-03-01&anchor=para_52_a&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of current borrowings. [Refer: Borrowings] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_55&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition Exchange rate on current borrowings + References No definition available. + Details
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- Details
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- Details
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