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Description of Business and Segmented Disclosures - Schedule of Geographical Information (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 geographical areas [line items] |  |  |  |  |  |  |
Revenue | $ 12,698 | $ 3,659 | $ 32,425 | $ 9,794 | $ 13,220 | $ 20,180 | $ 20,843
Non-Current Assets | 43,945 |  | 43,945 |  | 29,631 |  |
Canada |  |  |  |  |  |  |
Disclosure of geographical areas [line items] |  |  |  |  |  |  |
Revenue | 6,243 | 2,418 | 16,774 | 6,082 |  |  |
Non-Current Assets | 34,506 |  | 34,506 |  | 26,041 |  |
United States |  |  |  |  |  |  |
Disclosure of geographical areas [line items] |  |  |  |  |  |  |
Revenue | 6,139 | 1,241 | 14,740 | 3,712 |  |  |
Non-Current Assets | 6,433 |  | 6,433 |  | 3,590 |  |
China |  |  |  |  |  |  |
Disclosure of geographical areas [line items] |  |  |  |  |  |  |
Revenue | 316 | $ 0 | 911 | $ 0 |  |  |
Non-Current Assets | 2,602 |  | 2,602 |  | 0 |  |
Indonesia |  |  |  |  |  |  |
Disclosure of geographical areas [line items] |  |  |  |  |  |  |
Non-Current Assets | $ 404 |  | $ 404 |  | $ 0 |  |

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