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Leases - Disclosure of Right-Of-Use Assets (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
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)
Ending balance | (53,818) | (51,685)
ACCUMULATED DEPRECIATION | Discontinued operations |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Discontinued operations |  | (147)
Right-of-use assets |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | 4,126 | 4,424
Ending balance | 4,079 | 4,126
Right-of-use assets | COST |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | 6,685 | 6,542
Additions | 788 | 670
Transfers | (255) | (362)
Acquired through business combinations | 12 | 4
Lease terminations | (53) | (30)
Impairment losses recognized in earnings | (6) | (10)
Ending balance | 7,171 | 6,685
Right-of-use assets | COST | Discontinued operations |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Discontinued operations |  | (129)
Right-of-use assets | ACCUMULATED DEPRECIATION |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | (2,559) | (2,118)
Transfers | (133) | (199)
Lease terminations | (28) | (8)
Depreciation | 694 | 671
Ending balance | (3,092) | (2,559)
Right-of-use assets | ACCUMULATED DEPRECIATION | Discontinued operations |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Discontinued operations |  | (23)
Right-of-use assets | NETWORK INFRASTRUCTURE AND EQUIPMENT |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | 2,217 | 2,308
Ending balance | 1,686 | 2,217
Right-of-use assets | NETWORK INFRASTRUCTURE AND EQUIPMENT | COST |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | 3,690 | 3,609
Additions | 574 | 470
Transfers | (977) | (360)
Acquired through business combinations | 0 | 0
Lease terminations | (47) | (20)
Impairment losses recognized in earnings | 0 | (1)
Ending balance | 3,240 | 3,690
Right-of-use assets | NETWORK INFRASTRUCTURE AND EQUIPMENT | COST | Discontinued operations |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Discontinued operations |  | (8)
Right-of-use assets | NETWORK INFRASTRUCTURE AND EQUIPMENT | ACCUMULATED DEPRECIATION |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | (1,473) | (1,301)
Transfers | (310) | (199)
Lease terminations | (28) | (2)
Depreciation | 419 | 377
Ending balance | (1,554) | (1,473)
Right-of-use assets | NETWORK INFRASTRUCTURE AND EQUIPMENT | ACCUMULATED DEPRECIATION | Discontinued operations |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Discontinued operations |  | (4)
Right-of-use assets | LAND AND BUILDINGS |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | 1,909 | 2,116
Ending balance | 2,393 | 1,909
Right-of-use assets | LAND AND BUILDINGS | COST |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | 2,995 | 2,933
Additions | 214 | 200
Transfers | 722 | (2)
Acquired through business combinations | 12 | 4
Lease terminations | (6) | (10)
Impairment losses recognized in earnings | (6) | (9)
Ending balance | 3,931 | 2,995
Right-of-use assets | LAND AND BUILDINGS | COST | Discontinued operations |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Discontinued operations |  | (121)
Right-of-use assets | LAND AND BUILDINGS | ACCUMULATED DEPRECIATION |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | (1,086) | (817)
Transfers | 177 | 0
Lease terminations | 0 | (6)
Depreciation | 275 | 294
Ending balance | $ (1,538) | (1,086)
Right-of-use assets | LAND AND BUILDINGS | ACCUMULATED DEPRECIATION | Discontinued operations |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Discontinued operations |  | $ (19)

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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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