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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, 2022
Dec. 31, 2021
Reconciliation of changes in property, plant and equipment [abstract]    
Total property, plant and equipment, beginning balance $ 14,666  
Total property, plant and equipment, ending balance 15,574 $ 14,666
Net carrying amount    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment at beginning of period 12,681 12,167
Right-of-use assets at beginning of period 1,985 1,851
Total property, plant and equipment, beginning balance 14,666 14,018
Total property, plant and equipment, ending balance 15,574 14,666
Property, plant and equipment at end of period 13,523 12,681
Right-of-use assets at end of period 2,051 1,985
Cost    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment at beginning of period 35,373 33,851
Right-of-use assets at beginning of period 2,626 2,248
Additions and transfers 3,075 2,788
Additions to right-of-use assets 451 380
Acquisitions from business combinations 10 41
Acquisitions of right-of-use assets 0 0
Disposals and other (1,247) (1,307)
Disposals and other, right-of-use assets (149) (2)
Disposals and other 1,396 1,309
Total property, plant and equipment, beginning balance 37,999 36,099
Total property, plant and equipment, ending balance 40,139 37,999
Property, plant and equipment at end of period 37,211 35,373
Right-of-use assets at end of period 2,928 2,626
Additions Other Than Through Business Combinations, Property, Plant, and Equipment and Right-of-Use Assets 3,526 3,168
Accumulated depreciation    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment at beginning of period (22,692) (21,684)
Right-of-use assets at beginning of period (641) (397)
Disposals and other 1,285 1,314
Disposals and other, right-of-use assets 38 2
Disposals and other (1,323) (1,316)
Depreciation 2,281 2,322
Depreciation, right-of-use assets 274 246
Total property, plant and equipment, beginning balance 23,333 22,081
Total property, plant and equipment, ending balance 24,565 23,333
Property, plant and equipment at end of period (23,688) (22,692)
Right-of-use assets at end of period (877) (641)
Depreciation, Property, Plant, and Equipment and Right-of-Use Assets 2,555 2,568
Land and buildings | Net carrying amount    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment at beginning of period 710 714
Property, plant and equipment at end of period 716 710
Land and buildings | Cost    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment at beginning of period 1,241 1,210
Additions and transfers 44 29
Acquisitions from business combinations 0 2
Disposals and other (2) 0
Property, plant and equipment at end of period 1,283 1,241
Land and buildings | Accumulated depreciation    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment at beginning of period (531) (496)
Disposals and other 0 0
Depreciation 36 35
Property, plant and equipment at end of period (567) (531)
Cable and wireless network | Net carrying amount    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment at beginning of period 7,665 7,645
Property, plant and equipment at end of period 8,161 7,665
Cable and wireless network | Cost    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment at beginning of period 22,307 21,913
Additions and transfers 1,657 1,167
Acquisitions from business combinations 10 29
Disposals and other (864) (802)
Property, plant and equipment at end of period 23,110 22,307
Cable and wireless network | Accumulated depreciation    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment at beginning of period (14,642) (14,268)
Disposals and other 863 796
Depreciation 1,170 1,170
Property, plant and equipment at end of period (14,949) (14,642)
Computer equipment and software | Net carrying amount    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment at beginning of period 1,925 1,825
Property, plant and equipment at end of period 1,913 1,925
Computer equipment and software | Cost    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment at beginning of period 6,607 6,078
Additions and transfers 729 849
Acquisitions from business combinations 0 1
Disposals and other (344) (321)
Property, plant and equipment at end of period 6,992 6,607
Computer equipment and software | Accumulated depreciation    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment at beginning of period (4,682) (4,253)
Disposals and other 342 322
Depreciation 739 751
Property, plant and equipment at end of period (5,079) (4,682)
Customer premise equipment | Net carrying amount    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment at beginning of period 351 439
Property, plant and equipment at end of period 349 351
Customer premise equipment | Cost    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment at beginning of period 1,955 1,954
Additions and transfers 165 142
Acquisitions from business combinations 0 6
Disposals and other (23) (147)
Property, plant and equipment at end of period 2,097 1,955
Customer premise equipment | Accumulated depreciation    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment at beginning of period (1,604) (1,515)
Disposals and other 66 156
Depreciation 210 245
Property, plant and equipment at end of period (1,748) (1,604)
Leasehold improvements | Net carrying amount    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment at beginning of period 327 305
Property, plant and equipment at end of period 321 327
Leasehold improvements | Cost    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment at beginning of period 680 618
Additions and transfers 34 62
Acquisitions from business combinations 0 0
Disposals and other (3) 0
Property, plant and equipment at end of period 711 680
Leasehold improvements | Accumulated depreciation    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment at beginning of period (353) (313)
Disposals and other 3 1
Depreciation 40 41
Property, plant and equipment at end of period (390) (353)
Equipment and vehicles | Net carrying amount    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment at beginning of period 373 391
Property, plant and equipment at end of period 357 373
Equipment and vehicles | Cost    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment at beginning of period 1,253 1,230
Additions and transfers 70 57
Acquisitions from business combinations 0 3
Disposals and other (11) (37)
Property, plant and equipment at end of period 1,312 1,253
Equipment and vehicles | Accumulated depreciation    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment at beginning of period (880) (839)
Disposals and other 11 39
Depreciation 86 80
Property, plant and equipment at end of period (955) (880)
Construction in process | Net carrying amount    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment at beginning of period 1,330 848
Property, plant and equipment at end of period 1,706 1,330
Construction in process | Cost    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment at beginning of period 1,330 848
Additions and transfers 376 482
Acquisitions from business combinations 0 0
Disposals and other 0 0
Property, plant and equipment at end of period 1,706 1,330
Construction in process | Accumulated depreciation    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment at beginning of period 0 0
Disposals and other 0 0
Depreciation 0 0
Property, plant and equipment at end of period $ 0 $ 0