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PROPERTY, PLANT AND EQUIPMENT - Cost, Depreciation, Net Carrying Amount (Details) - CAD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment $ 12,167 $ 12,198 $ 11,780
Right-of-use assets 1,851 1,736 0
Total 14,018 13,934 11,780
Cost      
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment 33,851 32,666 31,402
Right-of-use assets 2,248 1,911  
Total 36,099 34,577  
Accumulated depreciation      
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment (21,684) (20,468) (19,622)
Right-of-use assets (397) (175)  
Total (22,081) (20,643)  
Land and buildings      
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment 716 721 697
Land and buildings | Cost      
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment 1,212 1,182 1,125
Land and buildings | Accumulated depreciation      
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment (496) (461) (428)
Cable and wireless network      
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment 8,089 7,964 7,474
Cable and wireless network | Cost      
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment 22,357 21,778 21,024
Cable and wireless network | Accumulated depreciation      
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment (14,268) (13,814) (13,550)
Computer equipment and software      
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment 2,108 2,154 2,209
Computer equipment and software | Cost      
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment 6,361 5,903 5,514
Computer equipment and software | Accumulated depreciation      
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment (4,253) (3,749) (3,305)
Customer premise equipment      
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment 461 576 629
Customer premise equipment | Cost      
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment 1,976 1,963 1,908
Customer premise equipment | Accumulated depreciation      
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment (1,515) (1,387) (1,279)
Leasehold improvements      
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment 312 315 289
Leasehold improvements | Cost      
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment 625 596 539
Leasehold improvements | Accumulated depreciation      
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment (313) (281) (250)
Equipment and vehicles      
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment 481 468 482
Equipment and vehicles | Cost      
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment 1,320 1,244 1,292
Equipment and vehicles | Accumulated depreciation      
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment $ (839) $ (776) $ (810)