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Property, plant and equipment - Schedule of Property, Plant and Equipment (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | $ 27,513 | $ 27,636
Ending balance | 28,235 | 27,513
Discontinued operations |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | 484 |
Ending balance |  | 484
COST |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | 79,198 | 77,363
Additions | 5,484 | 4,732
Acquired through business combinations | 14 | 7
Transfers | (1,034) | (812)
Retirements and disposals | 1,587 | 1,434
Impairment losses recognized in earnings | (19) | (27)
Reclassified to assets held for sale | 3 |
Ending balance | 82,053 | 79,198
COST | Discontinued operations |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Discontinued operations |  | (631)
ACCUMULATED DEPRECIATION |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | (51,685) | (49,727)
Transfers | 96 |
Retirements and disposals | (1,542) | (1,322)
Reclassified to assets held for sale | (1) |
Depreciation | 3,627 | 3,475
Other | (47) | (48)
Ending balance | (53,818) | (51,685)
ACCUMULATED DEPRECIATION | Discontinued operations |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Discontinued operations |  | (147)
NETWORK INFRASTRUCTURE AND EQUIPMENT |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | 21,914 | 21,683
Ending balance | 21,801 | 21,914
NETWORK INFRASTRUCTURE AND EQUIPMENT | COST |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | 69,477 | 67,597
Additions | 2,643 | 2,414
Acquired through business combinations | 2 | 2
Transfers | 358 | 964
Retirements and disposals | 1,550 | 1,348
Impairment losses recognized in earnings | (4) | (17)
Reclassified to assets held for sale | 3 |
Ending balance | 70,923 | 69,477
NETWORK INFRASTRUCTURE AND EQUIPMENT | COST | Discontinued operations |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Discontinued operations |  | (135)
NETWORK INFRASTRUCTURE AND EQUIPMENT | ACCUMULATED DEPRECIATION |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | (47,563) | (45,914)
Transfers | (95) |
Retirements and disposals | (1,515) | (1,268)
Reclassified to assets held for sale | (1) |
Depreciation | 3,220 | 3,035
Other | (50) | (48)
Ending balance | (49,122) | (47,563)
NETWORK INFRASTRUCTURE AND EQUIPMENT | ACCUMULATED DEPRECIATION | Discontinued operations |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Discontinued operations |  | (70)
LAND AND BUILDINGS |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | 3,710 | 4,266
Ending balance | 4,193 | 3,710
LAND AND BUILDINGS | COST |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | 7,832 | 8,079
Additions | 326 | 247
Acquired through business combinations | 12 | 5
Transfers | 771 | 49
Retirements and disposals | 37 | 54
Impairment losses recognized in earnings | (15) | (9)
Reclassified to assets held for sale | 0 |
Ending balance | 8,889 | 7,832
LAND AND BUILDINGS | COST | Discontinued operations |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Discontinued operations |  | (485)
LAND AND BUILDINGS | ACCUMULATED DEPRECIATION |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | (4,122) | (3,813)
Transfers | 191 |
Retirements and disposals | (27) | (54)
Reclassified to assets held for sale | 0 |
Depreciation | 407 | 440
Other | 3 | 0
Ending balance | (4,696) | (4,122)
LAND AND BUILDINGS | ACCUMULATED DEPRECIATION | Discontinued operations |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Discontinued operations |  | (77)
ASSETS UNDER CONSTRUCTION |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | 1,889 | 1,687
Ending balance | 2,241 | 1,889
ASSETS UNDER CONSTRUCTION | COST |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | 1,889 | 1,687
Additions | 2,515 | 2,071
Acquired through business combinations | 0 | 0
Transfers | (2,163) | (1,825)
Retirements and disposals | 0 | 32
Impairment losses recognized in earnings | 0 | (1)
Reclassified to assets held for sale | 0 |
Ending balance | 2,241 | 1,889
ASSETS UNDER CONSTRUCTION | COST | Discontinued operations |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Discontinued operations |  | (11)
ASSETS UNDER CONSTRUCTION | ACCUMULATED DEPRECIATION |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | 0 | 0
Transfers | 0 |
Retirements and disposals | 0 | 0
Reclassified to assets held for sale | 0 |
Depreciation | 0 | 0
Other | 0 | 0
Ending balance | $ 0 | 0
ASSETS UNDER CONSTRUCTION | ACCUMULATED DEPRECIATION | Discontinued operations |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Discontinued operations |  | $ 0

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- Definition The increase in property, plant and equipment resulting from acquisitions through business combinations. [Refer: Business combinations [member]; Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2021-01-01 -Paragraph 73 -Subparagraph e -Clause iii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2021-en-r&anchor=para_73_e_iii&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The amount of depreciation of property, plant and equipment. [Refer: Depreciation and amortisation expense; Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2021-01-01 -Paragraph 73 -Subparagraph e -Clause vii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2021-en-r&anchor=para_73_e_vii&doctype=Standard -URIDate 2021-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2021-01-01 -Paragraph 75 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2021-en-r&anchor=para_75_a&doctype=Standard -URIDate 2021-03-24 + Details
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