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Financial Instrument Risk Management - Fair Value of Derivative Instruments (Details) - CAD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Derivative assets | $ 1,112 | $ 1,478
Derivative liabilities | (2,295) | (1,756)
Measured at fair value |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Derivative liabilities | (2,295) | (1,756)
Measured at fair value | Under 1 Year |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Derivative liabilities | (240) | (90)
Measured at fair value | 1 to 5 Years |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Derivative liabilities | (555) | (347)
Measured at fair value | Over 5 Years |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Derivative liabilities | (1,500) | (1,319)
Measured at fair value |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Derivative assets | 1,112 | 1,478
Measured at fair value | Under 1 Year |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Derivative assets | 100 | 97
Measured at fair value | 1 to 5 Years |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Derivative assets | 150 | 226
Measured at fair value | Over 5 Years |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Derivative assets | $ 862 | $ 1,155

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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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- 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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