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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