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Financial Instrument Risk Management - Fair Value of Derivative Instruments (Details) - CAD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
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Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Derivative assets | $ 1,583 | $ 2,160
Derivative liabilities | (1,392) | (1,744)
Measured at fair value |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Derivative liabilities | (1,392) | (1,744)
Measured at fair value | Under 1 Year |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Derivative liabilities | (97) | (215)
Measured at fair value | 1 to 5 Years |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Derivative liabilities | (184) | (245)
Measured at fair value | Over 5 Years |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Derivative liabilities | (1,111) | (1,284)
Measured at fair value |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Derivative assets | 1,583 | 2,160
Measured at fair value | Under 1 Year |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Derivative assets | 139 | 329
Measured at fair value | 1 to 5 Years |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Derivative assets | 249 | 223
Measured at fair value | Over 5 Years |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Derivative assets | $ 1,195 | $ 1,608

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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 2021-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_55&doctype=Standard -URIDate 2021-03-24 + 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 2021-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_55&doctype=Standard -URIDate 2021-03-24 + Details
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