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LONG-TERM DEBT - Long-Term Debt Activity (Details) CAD in Millions, $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2017 CAD | Mar. 31, 2017 CAD | May 31, 2016 CAD | Dec. 31, 2017 CAD | Dec. 31, 2017 USD ($) | Dec. 31, 2016 CAD | Dec. 31, 2016 USD ($)
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Repayment of long-term debt |  |  |  | CAD (1,034) |  | CAD (538) |
Net repayment of long-term debt |  |  |  | (1,034) |  | (538) |
Long-term debt net of transaction costs, beginning of period |  |  |  | 16,080 |  | 16,870 |
Net repayment of long-term debt |  |  |  | (1,034) |  | (538) |
Gain on foreign exchange |  |  |  | (608) |  | (245) |
Deferred transaction costs incurred |  |  |  | (3) |  | (12) |
Amortization of deferred transaction costs |  |  |  | 13 |  | 5 |
Long-term debt net of transaction costs, end of period |  |  |  | 14,448 |  | 16,080 |
Bank credit facilities |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Proceeds on issuance of long-term debt |  |  |  | 2,999 |  | 4,017 |
Repayment of long-term debt |  |  |  | (3,283) |  | (4,226) |
Net repayment of long-term debt |  |  |  | (284) |  | (209) |
Net repayment of long-term debt |  |  |  | (284) |  | (209) |
Bank Credit Facilities, Canadian Portion |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Proceeds on issuance of long-term debt |  |  |  | 1,730 |  | 1,140 |
Repayment of long-term debt |  |  |  | (1,830) |  | (1,540) |
Bank Credit Facilities, US Portion |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Proceeds on issuance of long-term debt |  |  |  | CAD 1,269 | $ 960 | CAD 2,877 | $ 2,188
Exchange rate on proceeds from non-current borrowings |  |  |  | 1.32 | 1.32 | 1.31 | 1.31
Repayment of long-term debt |  |  |  | CAD (1,453) | $ (1,110) | CAD (2,686) | $ (2,038)
Exchange rate on repayments of non-current borrowings |  |  |  | 1.31 | 1.31 | 1.32 | 1.32
Senior notes |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Proceeds on issuance of long-term debt |  |  |  | CAD 0 | $ 0 | CAD 671 |
Exchange rate on proceeds from non-current borrowings |  |  |  | 0.00 | 0.00 | 1.34 | 1.34
Repayment of long-term debt | CAD (500) | CAD (250) | CAD (1,000) | CAD (750) |  | CAD (1,000) |
Net repayment of long-term debt |  |  |  | (750) |  | (329) |
Net repayment of long-term debt |  |  |  | CAD (750) |  | CAD (329) |
Senior Notes Due 2026 |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Principal amount | $ |  |  |  |  |  |  | $ 500

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- Definition The amount of interest and other 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 Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 23 -IssueDate 2017-01-01 -Paragraph 26 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=23&date=2017-03-01&anchor=para_26_a&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of interest and other costs that an entity incurs in connection with the borrowing of funds. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_112_c&doctype=Standard -URIDate 2017-03-09 + Details
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