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Property, plant and equipment - Schedule of Property, Plant and Equipment (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | $ 27,636 | $ 27,101
Ending balance | 27,513 | 27,636
Discontinued operations |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Ending balance | 484 |
COST |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | 77,363 | 74,340
Additions | 4,732 | 4,769
Acquired through business combinations | 7 | 41
Transfers | (812) | (656)
Retirements and disposals | (1,434) | (1,127)
Impairment losses recognized in earnings | (27) | (15)
Ending balance | 79,198 | 77,363
COST | Discontinued operations |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Discontinued operations | (631) | 11
ACCUMULATED DEPRECIATION |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | (49,727) | (47,239)
Retirements and disposals | (1,322) | (1,030)
Depreciation | 3,475 | 3,458
Other | (48) | 23
Ending balance | (51,685) | (49,727)
ACCUMULATED DEPRECIATION | Discontinued operations |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Discontinued operations | (147) | 37
NETWORK INFRASTRUCTURE AND EQUIPMENT (1) |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | 21,683 | 21,214
Ending balance | 21,914 | 21,683
NETWORK INFRASTRUCTURE AND EQUIPMENT (1) | COST |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | 67,597 | 65,048
Additions | 2,414 | 2,508
Acquired through business combinations | 2 | 3
Transfers | 964 | 1,130
Retirements and disposals | (1,348) | (1,085)
Impairment losses recognized in earnings | (17) | (11)
Ending balance | 69,477 | 67,597
NETWORK INFRASTRUCTURE AND EQUIPMENT (1) | COST | Discontinued operations |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Discontinued operations | (135) | 4
NETWORK INFRASTRUCTURE AND EQUIPMENT (1) | ACCUMULATED DEPRECIATION |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | (45,914) | (43,834)
Retirements and disposals | (1,268) | (1,003)
Depreciation | 3,035 | 3,015
Other | (48) | 54
Ending balance | (47,563) | (45,914)
NETWORK INFRASTRUCTURE AND EQUIPMENT (1) | ACCUMULATED DEPRECIATION | Discontinued operations |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Discontinued operations | (70) | 14
LAND AND BUILDINGS |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | 4,266 | 4,123
Ending balance | 3,710 | 4,266
LAND AND BUILDINGS | COST |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | 8,079 | 7,528
Additions | 247 | 567
Acquired through business combinations | 5 | 38
Transfers | 49 | (14)
Retirements and disposals | (54) | (42)
Impairment losses recognized in earnings | (9) | (4)
Ending balance | 7,832 | 8,079
LAND AND BUILDINGS | COST | Discontinued operations |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Discontinued operations | (485) | 6
LAND AND BUILDINGS | ACCUMULATED DEPRECIATION |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | (3,813) | (3,405)
Retirements and disposals | (54) | (27)
Depreciation | 440 | 443
Other | 0 | (31)
Ending balance | (4,122) | (3,813)
LAND AND BUILDINGS | ACCUMULATED DEPRECIATION | Discontinued operations |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Discontinued operations | (77) | 23
ASSETS UNDER CONSTRUCTION |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | 1,687 | 1,764
Ending balance | 1,889 | 1,687
ASSETS UNDER CONSTRUCTION | COST |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | 1,687 | 1,764
Additions | 2,071 | 1,694
Acquired through business combinations | 0 | 0
Transfers | (1,825) | (1,772)
Retirements and disposals | (32) | 0
Impairment losses recognized in earnings | (1) | 0
Ending balance | 1,889 | 1,687
ASSETS UNDER CONSTRUCTION | COST | Discontinued operations |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Discontinued operations | (11) | 1
ASSETS UNDER CONSTRUCTION | ACCUMULATED DEPRECIATION |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | 0 | 0
Retirements and disposals | 0 | 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 | $ 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 2020-01-01 -Paragraph 73 -Subparagraph e -Clause iii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2020-en-r&anchor=para_73_e_iii&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of additions to property, plant and equipment other than those acquired 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 2020-01-01 -Paragraph 73 -Subparagraph e -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2020-en-r&anchor=para_73_e_i&doctype=Standard -URIDate 2020-01-01 + 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 2020-01-01 -Paragraph 73 -Subparagraph e -Clause vii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2020-en-r&anchor=para_73_e_vii&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2020-01-01 -Paragraph 75 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2020-en-r&anchor=para_75_a&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The decrease in property, plant and equipment resulting from disposals and retirements. [Refer: Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 16 -IssueDate 2020-01-01 -Paragraph 73 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2020-en-r&anchor=para_73_e&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of impairment loss recognised in profit or loss for property, plant and equipment. [Refer: Impairment loss recognised in profit or loss; Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2020-01-01 -Paragraph 73 -Subparagraph e -Clause v -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2020-en-r&anchor=para_73_e_v&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 98 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_98_a&doctype=Standard -URIDate 2020-01-01 + Details
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