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PROPERTY, PLANT AND EQUIPMENT - Changes in Net Carrying Amounts of Property, Plant and Equipment (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment $ 12,198 $ 11,780
Additions 2,312 2,845
Acquisitions from business combinations 43  
Depreciation (2,390) (2,297)
Disposals and other 4 (35)
Property, plant and equipment 12,167 12,198
Right-of-use assets (note 8) 1,736 0
Additions 337 335
Depreciation (217) (175)
Disposals and other (5) 0
Right-of-use assets (note 8) 1,851 1,736
Total property, plant and equipment 13,934 11,780
Additions 2,649 3,180
Depreciation (2,607) (2,472)
Disposals and other (1) (35)
Total property, plant and equipment 14,018 13,934
Proceeds on disposition 0 38
Land and buildings    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment 721 697
Additions 30 57
Acquisitions from business combinations 0  
Depreciation (37) (34)
Disposals and other 2 1
Property, plant and equipment 716 721
Cable and wireless network    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment 7,964 7,474
Additions 1,334 1,739
Acquisitions from business combinations 4  
Depreciation (1,196) (1,157)
Disposals and other (17) 3
Property, plant and equipment 8,089 7,964
Computer equipment and software    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment 2,154 2,209
Additions 653 644
Acquisitions from business combinations 37  
Depreciation (747) (706)
Disposals and other 11 7
Property, plant and equipment 2,108 2,154
Customer premise equipment    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment 576 629
Additions 165 236
Acquisitions from business combinations 0  
Depreciation (288) (292)
Disposals and other 8 3
Property, plant and equipment 461 576
Leasehold improvements    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment 315 289
Additions 32 60
Acquisitions from business combinations 1  
Depreciation (36) (33)
Disposals and other 0 (1)
Property, plant and equipment 312 315
Equipment and vehicles    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment 468 482
Additions 98 109
Acquisitions from business combinations 1  
Depreciation (86) (75)
Disposals and other 0 (48)
Property, plant and equipment $ 481 468
Effect of IFRS 16 transition    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment   (95)
Right-of-use assets (note 8)   1,576
Total property, plant and equipment   1,481
Effect of IFRS 16 transition | Land and buildings    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment   0
Effect of IFRS 16 transition | Cable and wireless network    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment   (95)
Effect of IFRS 16 transition | Computer equipment and software    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment   0
Effect of IFRS 16 transition | Customer premise equipment    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment   0
Effect of IFRS 16 transition | Leasehold improvements    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment   0
Effect of IFRS 16 transition | Equipment and vehicles    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment   $ 0