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PROPERTY, PLANT AND EQUIPMENT - Changes in Net Carrying Amounts of Property, Plant and Equipment (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Reconciliation of changes in property, plant and equipment [abstract] |  |
Property, plant and equipment including right-of-use assets at beginning of period | $ 24,332 |
Property, plant and equipment including right-of-use assets at end of period | 25,072 | $ 24,332
Net carrying amount |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Property, plant and equipment at beginning of period | 21,771 | 13,523
Property, plant and equipment including right-of-use assets at beginning of period | 24,332 | 15,574
Property, plant and equipment at end of period | 22,377 | 21,771
Property, plant and equipment including right-of-use assets at end of period | 25,072 | 24,332
Cost |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Property, plant and equipment at beginning of period | 47,412 | 37,211
Property, plant and equipment including right-of-use assets at beginning of period | 51,156 | 40,139
Additions and transfers to property, plant, and equipment | 4,100 | 4,042
Additions and transfers, including right-of-use assets | 4,580 | 4,793
Acquisitions from business combinations (note 3) |  | 7,714
Acquisitions from business combinations, including right-of-use assets |  | 8,042
Disposals and other | (1,134) | (1,555)
Disposals and other, including right-of-use assets | 1,311 | 1,818
Property, plant and equipment at end of period | 50,378 | 47,412
Property, plant and equipment including right-of-use assets at end of period | 54,425 | 51,156
Accumulated depreciation |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Property, plant and equipment at beginning of period | (25,641) | (23,688)
Property, plant and equipment including right-of-use assets at beginning of period | (26,824) | (24,565)
Disposals and other | 1,305 | 1,378
Disposals and other, including right-of-use assets | (1,544) | (1,443)
Depreciation | 3,665 | 3,331
Depreciation, property, plant and equipment including right-of-use assets | 4,073 | 3,702
Property, plant and equipment at end of period | (28,001) | (25,641)
Property, plant and equipment including right-of-use assets at end of period | (29,353) | (26,824)
Right-of-use assets | Net carrying amount |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Right-of-use assets at beginning of period | 2,561 | 2,051
Right-of-use assets at end of period | 2,695 | 2,561
Right-of-use assets | Cost |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Right-of-use assets at beginning of period | 3,744 | 2,928
Additions and transfers to right-of-use assets | 480 | 751
Acquisitions through business combinations, right-of-use assets |  | 328
Disposals and other, right-of-use assets | (177) | (263)
Right-of-use assets at end of period | 4,047 | 3,744
Right-of-use assets | Accumulated depreciation |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Right-of-use assets at beginning of period | (1,183) | (877)
Disposals and other, right-of-use assets | 239 | 65
Depreciation, right-of-use assets | 408 | 371
Right-of-use assets at end of period | (1,352) | (1,183)
Land and buildings | Property, plant and equipment | Net carrying amount |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Property, plant and equipment at beginning of period | 973 | 716
Property, plant and equipment at end of period | 1,291 | 973
Land and buildings | Property, plant and equipment | Cost |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Property, plant and equipment at beginning of period | 1,447 | 1,283
Additions and transfers to property, plant, and equipment | 296 | 108
Acquisitions from business combinations (note 3) |  | 308
Disposals and other | 262 | (252)
Property, plant and equipment at end of period | 2,005 | 1,447
Land and buildings | Property, plant and equipment | Accumulated depreciation |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Property, plant and equipment at beginning of period | (474) | (567)
Disposals and other | (134) | 148
Depreciation | 106 | 55
Property, plant and equipment at end of period | (714) | (474)
Cable and wireless network | Property, plant and equipment | Net carrying amount |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Property, plant and equipment at beginning of period | 14,459 | 8,161
Property, plant and equipment at end of period | 14,808 | 14,459
Cable and wireless network | Property, plant and equipment | Cost |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Property, plant and equipment at beginning of period | 30,499 | 23,110
Additions and transfers to property, plant, and equipment | 2,466 | 2,377
Acquisitions from business combinations (note 3) |  | 5,946
Disposals and other | (815) | (934)
Property, plant and equipment at end of period | 32,150 | 30,499
Cable and wireless network | Property, plant and equipment | Accumulated depreciation |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Property, plant and equipment at beginning of period | (16,040) | (14,949)
Disposals and other | 766 | 827
Depreciation | 2,068 | 1,918
Property, plant and equipment at end of period | (17,342) | (16,040)
Computer equipment and software | Property, plant and equipment | Net carrying amount |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Property, plant and equipment at beginning of period | 2,341 | 1,913
Property, plant and equipment at end of period | 1,926 | 2,341
Computer equipment and software | Property, plant and equipment | Cost |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Property, plant and equipment at beginning of period | 7,931 | 6,992
Additions and transfers to property, plant, and equipment | 425 | 868
Acquisitions from business combinations (note 3) |  | 370
Disposals and other | (442) | (299)
Property, plant and equipment at end of period | 7,914 | 7,931
Computer equipment and software | Property, plant and equipment | Accumulated depreciation |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Property, plant and equipment at beginning of period | (5,590) | (5,079)
Disposals and other | 468 | 299
Depreciation | 866 | 810
Property, plant and equipment at end of period | (5,988) | (5,590)
Customer premise equipment | Property, plant and equipment | Net carrying amount |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Property, plant and equipment at beginning of period | 930 | 349
Property, plant and equipment at end of period | 788 | 930
Customer premise equipment | Property, plant and equipment | Cost |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Property, plant and equipment at beginning of period | 3,003 | 2,097
Additions and transfers to property, plant, and equipment | 285 | 259
Acquisitions from business combinations (note 3) |  | 640
Disposals and other | (83) | 7
Property, plant and equipment at end of period | 3,205 | 3,003
Customer premise equipment | Property, plant and equipment | Accumulated depreciation |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Property, plant and equipment at beginning of period | (2,073) | (1,748)
Disposals and other | 148 | 77
Depreciation | 492 | 402
Property, plant and equipment at end of period | (2,417) | (2,073)
Leasehold improvements | Property, plant and equipment | Net carrying amount |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Property, plant and equipment at beginning of period | 370 | 321
Property, plant and equipment at end of period | 347 | 370
Leasehold improvements | Property, plant and equipment | Cost |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Property, plant and equipment at beginning of period | 817 | 711
Additions and transfers to property, plant, and equipment | 37 | 39
Acquisitions from business combinations (note 3) |  | 78
Disposals and other | (11) | (11)
Property, plant and equipment at end of period | 843 | 817
Leasehold improvements | Property, plant and equipment | Accumulated depreciation |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Property, plant and equipment at beginning of period | (447) | (390)
Disposals and other | 14 | 9
Depreciation | 63 | 66
Property, plant and equipment at end of period | (496) | (447)
Equipment and vehicles | Property, plant and equipment | Net carrying amount |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Property, plant and equipment at beginning of period | 434 | 357
Property, plant and equipment at end of period | 483 | 434
Equipment and vehicles | Property, plant and equipment | Cost |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Property, plant and equipment at beginning of period | 1,451 | 1,312
Additions and transfers to property, plant, and equipment | 121 | 106
Acquisitions from business combinations (note 3) |  | 99
Disposals and other | (45) | (66)
Property, plant and equipment at end of period | 1,527 | 1,451
Equipment and vehicles | Property, plant and equipment | Accumulated depreciation |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Property, plant and equipment at beginning of period | (1,017) | (955)
Disposals and other | 43 | 18
Depreciation | 70 | 80
Property, plant and equipment at end of period | (1,044) | (1,017)
Construction in process | Property, plant and equipment | Net carrying amount |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Property, plant and equipment at beginning of period | 2,264 | 1,706
Property, plant and equipment at end of period | 2,734 | 2,264
Construction in process | Property, plant and equipment | Cost |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Property, plant and equipment at beginning of period | 2,264 | 1,706
Additions and transfers to property, plant, and equipment | 470 | 285
Acquisitions from business combinations (note 3) |  | 273
Disposals and other | 0 | 0
Property, plant and equipment at end of period | 2,734 | 2,264
Construction in process | Property, plant and equipment | Accumulated depreciation |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Property, plant and equipment at beginning of period | 0 | 0
Disposals and other | 0 | 0
Depreciation | 0 | 0
Property, plant and equipment at end of period | $ 0 | $ 0

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- Definition The increase in property, plant and equipment resulting from acquisitions through business combinations. [Refer: Total for all business combinations [member]; Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2024-01-01 -Paragraph 73 -Subparagraph e -Clause iii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=16&code=ifrs-tx-2024-en-r&anchor=para_73_e_iii&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The increase in property, plant and equipment including right-of-use assets resulting from acquisitions 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 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 + Details
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- Definition The increase in right-of-use assets resulting from acquisitions through business combinations. [Refer: Total for all business combinations [member]; Right-of-use assets] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -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 + Details
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