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Foreign Exchange (Gain) Loss, Net - Schedule of Foreign Exchange Gain Loss Net (Detail) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Foreign Exchange Gains Losses: |  |  |
Unrealized Foreign Exchange (Gain) Loss | $ (131) | $ (827) | $ 649
Realized Foreign Exchange (Gain) Loss | (50) | 423 | 205
Total | (181) | (404) | 854
Long-term Borrowings [Member] |  |  |
Foreign Exchange Gains Losses: |  |  |
Unrealized Foreign Exchange (Gain) Loss | (194) | (800) | 602
Other [Member] |  |  |
Foreign Exchange Gains Losses: |  |  |
Unrealized Foreign Exchange (Gain) Loss | $ 63 | $ (27) | $ 47

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- Definition The amount of exchange differences recognised in profit or loss that arise from foreign currency transactions, excluding those arising on financial instruments measured at fair value through profit or loss in accordance with IFRS 9. [Refer: At fair value [member]; Financial instruments, class [member]] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 7 -IssueDate 2020-01-01 -Section A Statement of cash flows for an entity other than a financial institution -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2020-en-r&doctype=Illustrative%20Examples&dita_xref=IAS07_IE_A_TI -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 21 -IssueDate 2020-01-01 -Paragraph 52 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=21&code=ifrs-tx-2020-en-r&anchor=para_52_a&doctype=Standard -URIDate 2020-01-01 + Details
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