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Property, plant and equipment - Schedule of Property, Plant and Equipment (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance $ 28,235 $ 27,513
Ending balance 29,256 28,235
COST    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 82,053 79,198
Additions 5,893 5,484
Business combinations/(business disposition) (14) 14
Transfers (1,087) (1,034)
Retirements and disposals (3,101) (1,587)
Impairment losses recognized in earnings (132) (19)
Reclassified to assets held for sale   3
Ending balance 83,612 82,053
ACCUMULATED DEPRECIATION    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance (53,818) (51,685)
Transfers 0 96
Retirements and disposals 3,053 1,542
Reclassified to assets held for sale   (1)
Depreciation 3,660 3,627
Business disposition (21)  
Other (48) (47)
Ending balance (54,356) (53,818)
NETWORK INFRASTRUCTURE AND EQUIPMENT    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 21,801 21,914
Ending balance 22,639 21,801
NETWORK INFRASTRUCTURE AND EQUIPMENT | COST    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 70,923 69,477
Additions 2,824 2,643
Business combinations/(business disposition) 11 2
Transfers 1,180 358
Retirements and disposals (3,063) (1,550)
Impairment losses recognized in earnings 0 (4)
Reclassified to assets held for sale   3
Ending balance 71,875 70,923
NETWORK INFRASTRUCTURE AND EQUIPMENT | ACCUMULATED DEPRECIATION    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance (49,122) (47,563)
Transfers 2 (95)
Retirements and disposals 3,025 1,515
Reclassified to assets held for sale   (1)
Depreciation 3,195 3,220
Business disposition (14)  
Other (44) (50)
Ending balance (49,236) (49,122)
LAND AND BUILDINGS    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 4,193 3,710
Ending balance 4,019 4,193
LAND AND BUILDINGS | COST    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 8,889 7,832
Additions 394 326
Business combinations/(business disposition) (28) 12
Transfers 51 771
Retirements and disposals (35) (37)
Impairment losses recognized in earnings (132) (15)
Reclassified to assets held for sale   0
Ending balance 9,139 8,889
LAND AND BUILDINGS | ACCUMULATED DEPRECIATION    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance (4,696) (4,122)
Transfers (2) 191
Retirements and disposals 28 27
Reclassified to assets held for sale   0
Depreciation 465 407
Business disposition (7)  
Other (4) 3
Ending balance (5,120) (4,696)
ASSETS UNDER CONSTRUCTION    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 2,241 1,889
Ending balance 2,598 2,241
ASSETS UNDER CONSTRUCTION | COST    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 2,241 1,889
Additions 2,675 2,515
Business combinations/(business disposition) 3 0
Transfers (2,318) (2,163)
Retirements and disposals (3) 0
Impairment losses recognized in earnings 0 0
Reclassified to assets held for sale   0
Ending balance 2,598 2,241
ASSETS UNDER CONSTRUCTION | ACCUMULATED DEPRECIATION    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 0 0
Transfers 0 0
Retirements and disposals 0 0
Reclassified to assets held for sale   0
Depreciation 0 0
Business disposition 0  
Other 0 0
Ending balance $ 0 $ 0