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FINANCIAL RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - Derivative Instruments - Net Asset (Liability) Position (Details) CAD in Millions, $ in Millions | Dec. 31, 2017 CAD | Dec. 31, 2017 USD ($) | Dec. 31, 2016 CAD | Dec. 31, 2016 USD ($) | Dec. 31, 2015 CAD
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Disclosure of detailed information about hedging instruments [line items] |  |  |  |  |
Derivative financial assets | CAD 1,094 |  | CAD 1,659 |  | CAD 2,080
Debt derivatives |  |  |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |  |  |
Exchange rate, assets | 1.2869 | 1.2869 | 1.3407 | 1.3407 |
Derivative financial assets | CAD 1,129 |  | CAD 1,683 |  |
Notional amount, liabilities | 960 | $ 746 | 201 | $ 150 |
Fair value | (23) |  | 0 |  | 0
Debt derivatives | Cash flow hedges |  |  |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |  |  |
Notional amount, assets | CAD 5,409 | $ 5,200 | CAD 5,409 | $ 5,200 |
Exchange rate, assets | 1.3388 | 1.3388 | 1.3388 | 1.3388 |
Derivative financial assets | CAD 1,152 |  | CAD 1,683 |  | 2,028
Notional amount, liabilities | CAD 2,008 | $ 1,500 | CAD 2,008 | $ 1,500 |
Exchange rate, liabilities | 1.0401 | 1.0401 | 1.0401 | 1.0401 |
Bond forward | Cash flow hedges |  |  |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |  |  |
Notional amount, liabilities | CAD 900 |  | CAD 900 |  |
Fair value | (64) |  | (51) |  | (91)
Expenditure derivatives | Cash flow hedges |  |  |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |  |  |
Notional amount, assets | CAD 294 | $ 240 | CAD 1,284 | $ 990 |
Exchange rate, assets | 1.2953 | 1.2953 | 1.4129 | 1.4129 |
Derivative financial assets |  |  | CAD 19 |  | 158
Notional amount, liabilities | CAD 1,243 | $ 960 | CAD 424 | $ 300 |
Exchange rate, liabilities | 1.2239 | 1.2239 | 1.2967 | 1.2967 |
Fair value | CAD (39) |  |  |  |
Equity derivatives |  |  |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |  |  |
Notional amount, assets | 276 |  | CAD 270 |  |
Derivative financial assets | CAD 68 |  | CAD 8 |  | CAD (15)

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- Definition The amount of financial liabilities classified as derivative instruments. [Refer: Financial assets; Derivatives [member]] + 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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