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Leases - Disclosure of Right-Of-Use Assets (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance $ 30,352 $ 29,256
Ending balance 30,001 30,352
Right-of-use assets    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 4,726 4,150
Ending balance   4,726
Right-of-use assets    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 4,726  
Ending balance 4,553 4,726
Cost    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 86,836 83,612
Additions 4,629 5,961
Business acquisitions/(business disposition) 266 (195)
Reclassified to assets held for sale (11) (18)
Ending balance 88,537 86,836
Cost | Right-of-use assets    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 9,045 7,812
Additions   1,561
Transfers   (219)
Business acquisitions/(business disposition)   (20)
Lease terminations   (52)
Impairment losses recognized in earnings   (30)
Ending balance   9,045
Cost | Right-of-use assets    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 9,045  
Additions 771  
Transfers (250)  
Business acquisitions/(business disposition) 140  
Lease terminations (190)  
Impairment losses recognized in earnings (86)  
Reclassified to assets held for sale (10) (7)
Ending balance 9,420 9,045
Accumulated depreciation    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance (56,484) (54,356)
Business acquisitions/(business disposition)   (18)
Reclassified to assets held for sale   (6)
Ending balance (58,536) (56,484)
Accumulated depreciation | Right-of-use assets    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance (4,319) (3,662)
Depreciation   789
Transfers   (114)
Business acquisitions/(business disposition)   (3)
Lease terminations   (15)
Ending balance   (4,319)
Accumulated depreciation | Right-of-use assets    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance (4,319)  
Depreciation 848  
Transfers (133)  
Lease terminations (167)  
Ending balance (4,867) (4,319)
Network infrastructure and equipment | Right-of-use assets    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 2,168 1,889
Ending balance   2,168
Network infrastructure and equipment | Right-of-use assets    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 2,168  
Ending balance 2,024 2,168
Network infrastructure and equipment | Cost | Right-of-use assets    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 4,271 3,693
Additions   832
Transfers   (215)
Business acquisitions/(business disposition)   0
Lease terminations   (37)
Impairment losses recognized in earnings   0
Ending balance   4,271
Network infrastructure and equipment | Cost | Right-of-use assets    
Reconciliation of changes in property, plant and equipment [abstract]    
Additions 444  
Transfers (245)  
Business acquisitions/(business disposition) 0  
Lease terminations (49)  
Impairment losses recognized in earnings 0  
Reclassified to assets held for sale 0 (2)
Ending balance 4,421  
Network infrastructure and equipment | Accumulated depreciation | Right-of-use assets    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance (2,103) (1,804)
Depreciation   425
Transfers   (113)
Business acquisitions/(business disposition)   0
Lease terminations   (13)
Ending balance   (2,103)
Network infrastructure and equipment | Accumulated depreciation | Right-of-use assets    
Reconciliation of changes in property, plant and equipment [abstract]    
Depreciation 464  
Transfers (135)  
Lease terminations (35)  
Ending balance (2,397)  
Land and buildings | Right-of-use assets    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 2,558 2,261
Ending balance   2,558
Land and buildings | Right-of-use assets    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 2,558  
Ending balance 2,529 2,558
Land and buildings | Cost | Right-of-use assets    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 4,774 4,119
Additions   729
Transfers   (4)
Business acquisitions/(business disposition)   (20)
Lease terminations   (15)
Impairment losses recognized in earnings   (30)
Ending balance   4,774
Land and buildings | Cost | Right-of-use assets    
Reconciliation of changes in property, plant and equipment [abstract]    
Additions 327  
Transfers (5)  
Business acquisitions/(business disposition) 140  
Lease terminations (141)  
Impairment losses recognized in earnings (86)  
Reclassified to assets held for sale (10) (5)
Ending balance 4,999  
Land and buildings | Accumulated depreciation | Right-of-use assets    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance (2,216) (1,858)
Depreciation   364
Transfers   (1)
Business acquisitions/(business disposition)   (3)
Lease terminations   (2)
Ending balance   $ (2,216)
Land and buildings | Accumulated depreciation | Right-of-use assets    
Reconciliation of changes in property, plant and equipment [abstract]    
Depreciation 384  
Transfers 2  
Lease terminations (132)  
Ending balance $ (2,470)