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Foreign Exchange (Gain) Loss, Net - Schedule of Foreign Exchange Gain Loss Net (Detail) - CAD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure Of Effect Of Changes In Foreign Exchange Rates Gain Loss [Line Items] |  |  |  |  |  |  |
Unrealized Foreign Exchange (Gain) Loss | $ 111 | $ (140) | $ (220) | $ 229 |  |  |
Realized Foreign Exchange (Gain) Loss | 85 | (19) | 127 | (61) |  |  |
Total | 196 | (159) | (93) | 168 | $ (181) | $ (404) | $ 854
U.S. Dollar Debt Issued From Canada |  |  |  |  |  |  |
Disclosure Of Effect Of Changes In Foreign Exchange Rates Gain Loss [Line Items] |  |  |  |  |  |  |
Unrealized Foreign Exchange (Gain) Loss | 148 | (152) | (132) | 164 |  |  |
Other |  |  |  |  |  |  |
Disclosure Of Effect Of Changes In Foreign Exchange Rates Gain Loss [Line Items] |  |  |  |  |  |  |
Unrealized Foreign Exchange (Gain) Loss | $ (37) | $ 12 | $ (88) | $ 65 |  |  |

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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/disclosureRef -Name IAS -Number 21 -IssueDate 2021-01-01 -Paragraph 52 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=21&code=ifrs-tx-2021-en-r&anchor=para_52_a&doctype=Standard -URIDate 2021-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 35 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_35&doctype=Standard -URIDate 2021-03-24 + Details
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