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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, 2019
Dec. 31, 2018
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment $ 11,780 $ 11,143
Additions 2,845 2,815
Depreciation (2,297) (2,174)
Disposals and other (35) (4)
Property, plant and equipment 12,198 11,780
Right-of-use assets (note 8) 0  
Additions 335  
Depreciation (175)  
Disposals and other 0  
Right-of-use assets (note 8) 1,736 0
Total property, plant and equipment 11,780  
Additions 3,180  
Depreciation (2,472)  
Disposals and other (35)  
Total property, plant and equipment 13,934 11,780
Proceeds on disposition 38 25
Land and buildings    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment 697 693
Additions 57 40
Depreciation (34) (32)
Disposals and other 1 (4)
Property, plant and equipment 721 697
Cable and wireless network    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment 7,474 7,046
Additions 1,739 1,556
Depreciation (1,157) (1,128)
Disposals and other 3 0
Property, plant and equipment 7,964 7,474
Computer equipment and software    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment 2,209 2,189
Additions 644 653
Depreciation (706) (633)
Disposals and other 7 0
Property, plant and equipment 2,154 2,209
Customer premise equipment    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment 629 475
Additions 236 423
Depreciation (292) (269)
Disposals and other 3 0
Property, plant and equipment 576 629
Leasehold improvements    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment 289 276
Additions 60 44
Depreciation (33) (31)
Disposals and other (1) 0
Property, plant and equipment 315 289
Equipment and vehicles    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment 482 464
Additions 109 99
Depreciation (75) (81)
Disposals and other (48) 0
Property, plant and equipment 468 482
Effect of IFRS 16 transition    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment (95)  
Property, plant and equipment   (95)
Right-of-use assets (note 8) 1,576  
Right-of-use assets (note 8)   1,576
Total property, plant and equipment 1,481  
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  
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)  
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  
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  
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  
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  
Property, plant and equipment   $ 0