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Property, plant and equipment - Schedule of Property, Plant and Equipment (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024
Changes in property, plant and equipment, including right-of-use assets [abstract] |  |
Beginning balance | $ 30,001 | $ 30,352
Ending balance | 33,541 | 30,001
Cost |  |
Changes in property, plant and equipment, including right-of-use assets [abstract] |  |
Beginning balance | 88,537 | 86,836
Additions | 4,578 | 4,629
Business acquisitions | 3,972 | 266
Transfers | (983) | (1,279)
Retirements and disposals | 2,905 | 1,724
Impairment (losses) reversals recognized in earnings | (123) | (180)
Reclassified to assets held for sale | (3) | (11)
Net foreign exchange differences | (32) |
Ending balance | 93,041 | 88,537
Accumulated depreciation |  |
Changes in property, plant and equipment, including right-of-use assets [abstract] |  |
Beginning balance | (58,536) | (56,484)
Depreciation | 3,861 | 3,758
Transfers | (6) |
Retirements and disposals | (2,844) | (1,661)
Net foreign exchange differences | (1) |
Other | (46) | (45)
Ending balance | (59,500) | (58,536)
Network infrastructure and equipment |  |
Changes in property, plant and equipment, including right-of-use assets [abstract] |  |
Beginning balance | 23,470 | 23,750
Ending balance | 26,143 | 23,470
Network infrastructure and equipment | Cost |  |
Changes in property, plant and equipment, including right-of-use assets [abstract] |  |
Beginning balance | 76,151 | 74,676
Additions | 1,983 | 2,092
Business acquisitions | 3,000 | 72
Transfers | 1,163 | 881
Retirements and disposals | 2,791 | 1,484
Impairment (losses) reversals recognized in earnings | (135) | (85)
Reclassified to assets held for sale | (1) | (1)
Net foreign exchange differences | (23) |
Ending balance | 79,347 | 76,151
Network infrastructure and equipment | Accumulated depreciation |  |
Changes in property, plant and equipment, including right-of-use assets [abstract] |  |
Beginning balance | (52,681) | (50,926)
Depreciation | 3,319 | 3,245
Transfers | 9 |
Retirements and disposals | (2,764) | (1,447)
Net foreign exchange differences | (1) |
Other | (40) | (43)
Ending balance | (53,204) | (52,681)
Land and buildings |  |
Changes in property, plant and equipment, including right-of-use assets [abstract] |  |
Beginning balance | 4,306 | 4,247
Ending balance | 4,817 | 4,306
Land and buildings | Cost |  |
Changes in property, plant and equipment, including right-of-use assets [abstract] |  |
Beginning balance | 10,161 | 9,805
Additions | 515 | 430
Business acquisitions | 537 | 184
Transfers | 3 | 79
Retirements and disposals | 109 | 232
Impairment (losses) reversals recognized in earnings | 12 | (95)
Reclassified to assets held for sale | (2) | (10)
Net foreign exchange differences | (4) |
Ending balance | 11,113 | 10,161
Land and buildings | Accumulated depreciation |  |
Changes in property, plant and equipment, including right-of-use assets [abstract] |  |
Beginning balance | (5,855) | (5,558)
Depreciation | 542 | 513
Transfers | (15) |
Retirements and disposals | (80) | (214)
Net foreign exchange differences | 0 |
Other | (6) | (2)
Ending balance | (6,296) | (5,855)
Assets under construction |  |
Changes in property, plant and equipment, including right-of-use assets [abstract] |  |
Beginning balance | 2,225 | 2,355
Ending balance | 2,581 | 2,225
Assets under construction | Cost |  |
Changes in property, plant and equipment, including right-of-use assets [abstract] |  |
Beginning balance | 2,225 | 2,355
Additions | 2,080 | 2,107
Business acquisitions | 435 | 10
Transfers | (2,149) | (2,239)
Retirements and disposals | 5 | 8
Impairment (losses) reversals recognized in earnings | 0 | 0
Reclassified to assets held for sale | 0 | 0
Net foreign exchange differences | (5) |
Ending balance | 2,581 | 2,225
Assets under construction | Accumulated depreciation |  |
Changes in property, plant and equipment, including right-of-use assets [abstract] |  |
Beginning balance | 0 | 0
Depreciation | 0 | 0
Transfers | 0 |
Retirements and disposals | 0 | 0
Net foreign exchange differences | 0 |
Other | 0 | 0
Ending balance | $ 0 | $ 0

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- Definition Acquisitions through business combinations (disposals), property, plant and equipment including right-of-use assets + References No definition available. + Details
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- Definition The amount of additions to property, plant and equipment including right-of-use assets other than those acquired through business combinations. [Refer: Total for all business combinations [member]; Property, plant and equipment including right-of-use assets] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 16 -IssueDate 2025-01-01 -Paragraph 73 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=16&code=ifrs-tx-2025-en-r&anchor=para_73_e&doctype=Standard -URIDate 2025-03-27 + Details
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- Definition Adjustments for impairment loss (reversal of impairment loss) on property, plant and equipment recognised in profit or loss to reconcile profit (loss) to net cash flow from (used in) operating activities. [Refer: Adjustments for impairment loss (reversal of impairment loss) recognised in profit or loss; Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 7 -IssueDate 2025-01-01 -Paragraph 20 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2025-en-r&anchor=para_20&doctype=Standard -URIDate 2025-03-27 + Details
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- Definition The increase (decrease) in property, plant and equipment including right-of-use assets resulting from net exchange differences arising on the translation of the financial statements from the functional currency into a different presentation currency, including the translation of a foreign operation into the presentation currency of the reporting entity. [Refer: Property, plant and equipment including right-of-use assets] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 16 -IssueDate 2025-01-01 -Paragraph 73 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=16&code=ifrs-tx-2025-en-r&anchor=para_73_e&doctype=Standard -URIDate 2025-03-27 + Details
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