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Segments Disclosures - Geographic Information (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disclosure of geographical areas [line items] |  |  |
Revenues | $ 2,721 | $ 2,101 | $ 2,347
PP&E | 5,320 | 5,822 | 6,207
Right-of-use assets | 95 | 141 | 146
Intangible assets | 256 | 313 | 318
Other assets | 142 | 206 |
Goodwill | 463 | 463 |
Canada |  |  |
Disclosure of geographical areas [line items] |  |  |
Revenues | 1,854 | 1,227 | 1,460
PP&E | 4,051 | 4,661 |
Right-of-use assets | 52 | 107 |
Intangible assets | 141 | 185 |
Other assets | 15 | 74 |
US |  |  |
Disclosure of geographical areas [line items] |  |  |
Revenues | 731 | 716 | 727
PP&E | 860 | 737 |
Right-of-use assets | 39 | 30 |
Intangible assets | 85 | 94 |
Other assets | 61 | 61 |
Australia |  |  |
Disclosure of geographical areas [line items] |  |  |
Revenues | 136 | 158 | $ 160
PP&E | 409 | 424 |
Right-of-use assets | 4 | 4 |
Intangible assets | 30 | 34 |
Other assets | $ 66 | $ 71 |

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