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Leases - Disclosure of Right-Of-Use Assets (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
Ending balance 83,612 82,053
ACCUMULATED DEPRECIATION    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance (53,818) (51,685)
Ending balance (54,356) (53,818)
Right-of-use assets    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 4,079 4,126
Ending balance 4,150 4,079
Right-of-use assets | COST    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 7,171 6,685
Additions 1,017 788
Transfers (201) (255)
Business combinations/(business disposition) (9) 12
Lease terminations (42) (53)
Impairment losses recognized in earnings (124) (6)
Ending balance 7,812 7,171
Right-of-use assets | ACCUMULATED DEPRECIATION    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance (3,092) (2,559)
Transfers (117) (133)
Business combinations/(business disposition) (7)  
Lease terminations (15) (28)
Depreciation 709 694
Ending balance (3,662) (3,092)
Right-of-use assets | NETWORK INFRASTRUCTURE AND EQUIPMENT    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 1,686 2,217
Ending balance 1,889 1,686
Right-of-use assets | NETWORK INFRASTRUCTURE AND EQUIPMENT | COST    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 3,240 3,690
Additions 681 574
Transfers (195) (977)
Business combinations/(business disposition) 2 0
Lease terminations (35) (47)
Impairment losses recognized in earnings 0 0
Ending balance 3,693 3,240
Right-of-use assets | NETWORK INFRASTRUCTURE AND EQUIPMENT | ACCUMULATED DEPRECIATION    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance (1,554) (1,473)
Transfers (112) (310)
Business combinations/(business disposition) 0  
Lease terminations (12) (28)
Depreciation 374 419
Ending balance (1,804) (1,554)
Right-of-use assets | LAND AND BUILDINGS    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 2,393 1,909
Ending balance 2,261 2,393
Right-of-use assets | LAND AND BUILDINGS | COST    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 3,931 2,995
Additions 336 214
Transfers (6) 722
Business combinations/(business disposition) (11) 12
Lease terminations (7) (6)
Impairment losses recognized in earnings (124) (6)
Ending balance 4,119 3,931
Right-of-use assets | LAND AND BUILDINGS | ACCUMULATED DEPRECIATION    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance (1,538) (1,086)
Transfers (5) 177
Business combinations/(business disposition) (7)  
Lease terminations (3) 0
Depreciation 335 275
Ending balance $ (1,858) $ (1,538)