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Leases - Disclosure of Right-Of-Use Assets (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
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)
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)
Reclassified to assets held for sale 6  
Ending balance (56,484) (54,356)
Right-of-use assets    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 4,150 4,079
Ending balance 4,726 4,150
Right-of-use assets | COST    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 7,812 7,171
Additions 1,561 1,017
Transfers (219) (201)
Business disposition (20) (9)
Lease terminations (52) (42)
Impairment losses recognized in earnings (30) (124)
Reclassified to assets held for sale (7)  
Ending balance 9,045 7,812
Right-of-use assets | ACCUMULATED DEPRECIATION    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance (3,662) (3,092)
Transfers (114) (117)
Business disposition (3) (7)
Lease terminations (15) (15)
Depreciation 789 709
Ending balance (4,319) (3,662)
Right-of-use assets | NETWORK INFRASTRUCTURE AND EQUIPMENT    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 1,889 1,686
Ending balance 2,168 1,889
Right-of-use assets | NETWORK INFRASTRUCTURE AND EQUIPMENT | COST    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 3,693 3,240
Additions 832 681
Transfers (215) (195)
Business disposition 0 2
Lease terminations (37) (35)
Impairment losses recognized in earnings 0 0
Reclassified to assets held for sale (2)  
Ending balance 4,271 3,693
Right-of-use assets | NETWORK INFRASTRUCTURE AND EQUIPMENT | ACCUMULATED DEPRECIATION    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance (1,804) (1,554)
Transfers (113) (112)
Business disposition 0 0
Lease terminations (13) (12)
Depreciation 425 374
Ending balance (2,103) (1,804)
Right-of-use assets | LAND AND BUILDINGS    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 2,261 2,393
Ending balance 2,558 2,261
Right-of-use assets | LAND AND BUILDINGS | COST    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 4,119 3,931
Additions 729 336
Transfers (4) (6)
Business disposition (20) (11)
Lease terminations (15) (7)
Impairment losses recognized in earnings (30) (124)
Reclassified to assets held for sale (5)  
Ending balance 4,774 4,119
Right-of-use assets | LAND AND BUILDINGS | ACCUMULATED DEPRECIATION    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance (1,858) (1,538)
Transfers (1) (5)
Business disposition (3) (7)
Lease terminations (2) (3)
Depreciation 364 335
Ending balance $ (2,216) $ (1,858)