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SHORT-TERM BORROWINGS - Proceeds/Repayments From Borrowing Programs (Details) CAD in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2017 CAD | Dec. 31, 2017 USD ($) | Dec. 31, 2016 CAD | Dec. 31, 2016 USD ($)
Disclosure of detailed information about borrowings [line items] |  |  |  |
Net proceeds (repayments) from current borrowings | CAD 858 |  | CAD 0 |
Accounts receivable securitization program |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Proceeds from current borrowings | 530 |  | 295 |
Repayments of current borrowings | (680) |  | (295) |
Net proceeds (repayments) from current borrowings | (150) |  | 0 |
US commercial paper |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Proceeds from current borrowings | CAD 10,712 | $ 8,267 | CAD 0 | $ 0
Exchange rate on proceeds from current borrowings | 1.30 | 1.30 | 0.00 | 0.00
Repayments of current borrowings | CAD (9,704) | $ (7,530) | CAD 0 | $ 0
Exchange rate on repayments of current borrowings | 1.29 | 1.29 | 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 |  |

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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 The cash inflow from current borrowings obtained. [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 The cash outflow for repayments of 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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