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FINANCIAL RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - Changes in Fair Value of Derivatives (Details) - CAD CAD in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative financial assets | CAD 1,094 | CAD 1,659 | CAD 2,080
Proceeds received from settlement of derivatives | (13,215) | (12,285) |
Payment on derivatives entered | 13,321 | 12,237 |
(Decrease) increase in fair value of derivatives | (671) | (373) |
Debt derivatives |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative financial liabilities | (23) | 0 | 0
Derivative financial assets | 1,129 | 1,683 |
Proceeds received from settlement of derivatives | (12,002) | (11,167) |
Payment on derivatives entered | 12,081 | 11,159 |
(Decrease) increase in fair value of derivatives | (102) | 8 |
Equity derivatives |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative financial assets | 68 | 8 | (15)
Proceeds received from settlement of derivatives | (6) | (2) |
Payment on derivatives entered | 0 | 0 |
(Decrease) increase in fair value of derivatives | 66 | 25 |
Cash flow hedges | Debt derivatives |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative financial assets | 1,152 | 1,683 | 2,028
Proceeds received from settlement of derivatives | 0 | 0 |
Payment on derivatives entered | 0 | 0 |
(Decrease) increase in fair value of derivatives | (531) | (345) |
Cash flow hedges | Bond forward |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative financial liabilities | (64) | (51) | (91)
Proceeds received from settlement of derivatives | 0 | 0 |
Payment on derivatives entered | 0 | 53 |
(Decrease) increase in fair value of derivatives | (13) | (13) |
Cash flow hedges | Expenditure derivatives |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative financial liabilities | (39) |  |
Derivative financial assets |  | 19 | CAD 158
Proceeds received from settlement of derivatives | (1,207) | (1,116) |
Payment on derivatives entered | 1,240 | 1,025 |
(Decrease) increase in fair value of derivatives | (91) | (48) |
Before Offset Amount |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative financial liabilities | (280) | (140) |
Derivative financial assets | 1,374 | 1,799 |
Before Offset Amount | Cash flow hedges | Debt derivatives |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative financial liabilities | (149) | (68) |
Derivative financial assets | 1,301 | 1,751 |
Before Offset Amount | Cash flow hedges | Expenditure derivatives |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative financial liabilities | (44) | (21) |
Derivative financial assets | CAD 5 | CAD 40 |

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- Definition The amount of financial assets 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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