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Financial Instrument Risk Management - Fair Value of Derivative Instruments (Details) - CAD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
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Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Derivative assets | $ 1,548 | $ 1,112
Derivative liabilities | (2,040) | (2,295)
Measured at fair value |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Derivative liabilities | (2,040) | (2,295)
Measured at fair value | Under 1 Year |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Derivative liabilities | (73) | (240)
Measured at fair value | 1 to 5 Years |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Derivative liabilities | (377) | (555)
Measured at fair value | Over 5 Years |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Derivative liabilities | (1,590) | (1,500)
Measured at fair value |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Derivative assets | 1,548 | 1,112
Measured at fair value | Under 1 Year |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Derivative assets | 180 | 100
Measured at fair value | 1 to 5 Years |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Derivative assets | 231 | 150
Measured at fair value | Over 5 Years |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Derivative assets | $ 1,137 | $ 862

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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 2019-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_55&doctype=Standard -URIDate 2019-03-27 + 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 2019-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_55&doctype=Standard -URIDate 2019-03-27 + Details
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