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Property, plant and equipment - Schedule of Property, Plant and Equipment (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance $ 29,256 $ 28,235
Impairment losses recognized in earnings (57) (132)
Ending balance 30,352 29,256
COST    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 83,612 82,053
Additions 5,961 5,893
Business disposition (195) (14)
Transfers (870) (1,087)
Retirements and disposals 1,612 3,101
Impairment losses recognized in earnings (42) (132)
Reclassified to assets held for sale (18)  
Ending balance 86,836 83,612
ACCUMULATED DEPRECIATION    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance (54,356) (53,818)
Business disposition   (21)
Transfers 25 0
Retirements and disposals (1,545) (3,053)
Reclassified to assets held for sale 6  
Depreciation 3,745 3,660
Business disposition (18)  
Other (73) (48)
Ending balance (56,484) (54,356)
NETWORK INFRASTRUCTURE AND EQUIPMENT    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 22,639 21,801
Ending balance 23,750 22,639
NETWORK INFRASTRUCTURE AND EQUIPMENT | COST    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 71,875 70,923
Additions 2,990 2,824
Business disposition 8 11
Transfers 1,368 1,180
Retirements and disposals 1,557 3,063
Impairment losses recognized in earnings 0 0
Reclassified to assets held for sale (8)  
Ending balance 74,676 71,875
NETWORK INFRASTRUCTURE AND EQUIPMENT | ACCUMULATED DEPRECIATION    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance (49,236) (49,122)
Business disposition   (14)
Transfers 23 2
Retirements and disposals (1,508) (3,025)
Reclassified to assets held for sale 6  
Depreciation 3,254 3,195
Business disposition (1)  
Other (72) (44)
Ending balance (50,926) (49,236)
LAND AND BUILDINGS    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 4,019 4,193
Ending balance 4,247 4,019
LAND AND BUILDINGS | COST    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 9,139 8,889
Additions 795 394
Business disposition (103) (28)
Transfers 79 51
Retirements and disposals 53 35
Impairment losses recognized in earnings (42) (132)
Reclassified to assets held for sale (10)  
Ending balance 9,805 9,139
LAND AND BUILDINGS | ACCUMULATED DEPRECIATION    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance (5,120) (4,696)
Business disposition   (7)
Transfers 2 (2)
Retirements and disposals (37) (28)
Reclassified to assets held for sale 0  
Depreciation 491 465
Business disposition (17)  
Other (1) (4)
Ending balance (5,558) (5,120)
ASSETS UNDER CONSTRUCTION    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 2,598 2,241
Ending balance 2,355 2,598
ASSETS UNDER CONSTRUCTION | COST    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 2,598 2,241
Additions 2,176 2,675
Business disposition (100) 3
Transfers (2,317) (2,318)
Retirements and disposals 2 3
Impairment losses recognized in earnings 0 0
Reclassified to assets held for sale 0  
Ending balance 2,355 2,598
ASSETS UNDER CONSTRUCTION | ACCUMULATED DEPRECIATION    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 0 0
Business disposition   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