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Segments Disclosures - Geographic Information (Details) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Disclosure of geographical areas [line items] |  |  |
Total revenue from contracts with customers | $ 2,845 | $ 3,355 | $ 2,976
Property, plant and equipment | 6,020 | 5,714 | 5,556
Right-of-use assets | 120 | 117 | 126
Intangible assets other than goodwill | 281 | 223 | 252
Total long-term other assets | 179 | 179 |
Canada |  |  |
Disclosure of geographical areas [line items] |  |  |
Total revenue from contracts with customers | 2,009 | 2,218 | 1,905
Property, plant and equipment | 3,828 | 3,578 |
Right-of-use assets | 41 | 43 |
Intangible assets other than goodwill | 170 | 108 |
Total long-term other assets | 85 | 68 |
U.S. |  |  |
Disclosure of geographical areas [line items] |  |  |
Total revenue from contracts with customers | 676 | 987 | 940
Property, plant and equipment | 1,852 | 1,749 |
Right-of-use assets | 74 | 71 |
Intangible assets other than goodwill | 86 | 88 |
Total long-term other assets | 36 | 42 |
Western Australia |  |  |
Disclosure of geographical areas [line items] |  |  |
Total revenue from contracts with customers | 160 | 150 | $ 131
Property, plant and equipment | 340 | 387 |
Right-of-use assets | 5 | 3 |
Intangible assets other than goodwill | 25 | 27 |
Total long-term other assets | $ 58 | $ 69 |

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- Definition The amount of identifiable non-monetary assets without physical substance. This amount does not include goodwill. [Refer: Goodwill] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 38 -IssueDate 2024-01-01 -Paragraph 118 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=38&code=ifrs-tx-2024-en-r&anchor=para_118_e&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 54 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_54_c&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The amount of tangible assets that: (a) are held for use in the production or supply of goods or services, for rental to others, or for administrative purposes; and (b) are expected to be used during more than one period. Note that right-of-use assets are not included. [Contrast: Property, plant and equipment including right-of-use assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2024-01-01 -Paragraph 73 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=16&code=ifrs-tx-2024-en-r&anchor=para_73_e&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 54 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_54_a&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The amount of revenue from contracts with customers. A customer is a party that has contracted with an entity to obtain goods or services that are an output of the entity’s ordinary activities in exchange for consideration. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2024-01-01 -Paragraph 114 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2024-en-r&anchor=para_114&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2024-01-01 -Paragraph 113 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2024-en-r&anchor=para_113_a&doctype=Standard -URIDate 2024-03-27 + Details
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