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Leases - Disclosure of Right-Of-Use Assets (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | $ 30,352 | $ 29,256
Ending balance | 30,001 | 30,352
Right-of-use assets |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | 4,726 | 4,150
Ending balance |  | 4,726
Right-of-use assets |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | 4,726 |
Ending balance | 4,553 | 4,726
Cost |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | 86,836 | 83,612
Additions | 4,629 | 5,961
Business acquisitions/(business disposition) | 266 | (195)
Reclassified to assets held for sale | (11) | (18)
Ending balance | 88,537 | 86,836
Cost | Right-of-use assets |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | 9,045 | 7,812
Additions |  | 1,561
Transfers |  | (219)
Business acquisitions/(business disposition) |  | (20)
Lease terminations |  | (52)
Impairment losses recognized in earnings |  | (30)
Ending balance |  | 9,045
Cost | Right-of-use assets |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | 9,045 |
Additions | 771 |
Transfers | (250) |
Business acquisitions/(business disposition) | 140 |
Lease terminations | (190) |
Impairment losses recognized in earnings | (86) |
Reclassified to assets held for sale | (10) | (7)
Ending balance | 9,420 | 9,045
Accumulated depreciation |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | (56,484) | (54,356)
Business acquisitions/(business disposition) |  | (18)
Reclassified to assets held for sale |  | (6)
Ending balance | (58,536) | (56,484)
Accumulated depreciation | Right-of-use assets |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | (4,319) | (3,662)
Depreciation |  | 789
Transfers |  | (114)
Business acquisitions/(business disposition) |  | (3)
Lease terminations |  | (15)
Ending balance |  | (4,319)
Accumulated depreciation | Right-of-use assets |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | (4,319) |
Depreciation | 848 |
Transfers | (133) |
Lease terminations | (167) |
Ending balance | (4,867) | (4,319)
Network infrastructure and equipment | Right-of-use assets |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | 2,168 | 1,889
Ending balance |  | 2,168
Network infrastructure and equipment | Right-of-use assets |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | 2,168 |
Ending balance | 2,024 | 2,168
Network infrastructure and equipment | Cost | Right-of-use assets |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | 4,271 | 3,693
Additions |  | 832
Transfers |  | (215)
Business acquisitions/(business disposition) |  | 0
Lease terminations |  | (37)
Impairment losses recognized in earnings |  | 0
Ending balance |  | 4,271
Network infrastructure and equipment | Cost | Right-of-use assets |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Additions | 444 |
Transfers | (245) |
Business acquisitions/(business disposition) | 0 |
Lease terminations | (49) |
Impairment losses recognized in earnings | 0 |
Reclassified to assets held for sale | 0 | (2)
Ending balance | 4,421 |
Network infrastructure and equipment | Accumulated depreciation | Right-of-use assets |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | (2,103) | (1,804)
Depreciation |  | 425
Transfers |  | (113)
Business acquisitions/(business disposition) |  | 0
Lease terminations |  | (13)
Ending balance |  | (2,103)
Network infrastructure and equipment | Accumulated depreciation | Right-of-use assets |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Depreciation | 464 |
Transfers | (135) |
Lease terminations | (35) |
Ending balance | (2,397) |
Land and buildings | Right-of-use assets |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | 2,558 | 2,261
Ending balance |  | 2,558
Land and buildings | Right-of-use assets |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | 2,558 |
Ending balance | 2,529 | 2,558
Land and buildings | Cost | Right-of-use assets |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | 4,774 | 4,119
Additions |  | 729
Transfers |  | (4)
Business acquisitions/(business disposition) |  | (20)
Lease terminations |  | (15)
Impairment losses recognized in earnings |  | (30)
Ending balance |  | 4,774
Land and buildings | Cost | Right-of-use assets |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Additions | 327 |
Transfers | (5) |
Business acquisitions/(business disposition) | 140 |
Lease terminations | (141) |
Impairment losses recognized in earnings | (86) |
Reclassified to assets held for sale | (10) | (5)
Ending balance | 4,999 |
Land and buildings | Accumulated depreciation | Right-of-use assets |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | (2,216) | (1,858)
Depreciation |  | 364
Transfers |  | (1)
Business acquisitions/(business disposition) |  | (3)
Lease terminations |  | (2)
Ending balance |  | $ (2,216)
Land and buildings | Accumulated depreciation | Right-of-use assets |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Depreciation | 384 |
Transfers | 2 |
Lease terminations | (132) |
Ending balance | $ (2,470) |

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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 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 amount of impairment loss recognised in profit or loss. [Refer: Impairment loss; Profit (loss)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2024-01-01 -Paragraph 126 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=36&code=ifrs-tx-2024-en-r&anchor=para_126_a&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2024-01-01 -Paragraph 129 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=36&code=ifrs-tx-2024-en-r&anchor=para_129_a&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The increase (decrease) in property, plant and equipment including right-of-use assets resulting from transfers from construction in progress. [Refer: Property, plant and equipment including right-of-use assets; Construction in progress] + 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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