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INTANGIBLE ASSETS AND GOODWILL - Changes in net carrying amounts of intangible assets and goodwill (Details) - CAD CAD in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Reconciliation of changes in intangible assets and goodwill [abstract] |  |
Net carrying amount | CAD 11,035 | CAD 11,148
Net additions | 254 | 46
Amortization | (119) | (164)
Other | (21) | 5
Net carrying amount | 11,149 | 11,035
Customer relationships |  |
Reconciliation of changes in intangible assets and goodwill [abstract] |  |
Net carrying amount | 139 | 195
Net additions | 0 | 0
Amortization | (55) | (58)
Other | 0 | 2
Net carrying amount | 84 | 139
Roaming agreements |  |
Reconciliation of changes in intangible assets and goodwill [abstract] |  |
Net carrying amount | 0 | 35
Net additions |  | 0
Amortization |  | (35)
Other |  | 0
Net carrying amount | 0 | 0
Intangible assets excluding goodwill and acquired program rights |  |
Reconciliation of changes in intangible assets and goodwill [abstract] |  |
Net carrying amount | 6,921 | 7,007
Net additions | 195 | 0
Amortization | (55) | (93)
Other | (11) | 7
Net carrying amount | 7,050 | 6,921
Acquired program rights |  |
Reconciliation of changes in intangible assets and goodwill [abstract] |  |
Net carrying amount | 209 | 236
Net additions | 59 | 46
Amortization | (64) | (71)
Other | (10) | (2)
Net carrying amount | 194 | 209
Goodwill |  |
Reconciliation of changes in intangible assets and goodwill [abstract] |  |
Net carrying amount | 3,905 | 3,905
Net additions | 0 | 0
Amortization | 0 | 0
Other | 0 | 0
Net carrying amount | 3,905 | 3,905
Total intangible assets [Member] |  |
Reconciliation of changes in intangible assets and goodwill [abstract] |  |
Net carrying amount | 7,130 | 7,243
Net additions | 254 | 46
Amortization | (119) | (164)
Other | (21) | 5
Net carrying amount | 7,244 | 7,130
Spectrum licences |  |
Reconciliation of changes in intangible assets and goodwill [abstract] |  |
Net carrying amount | 6,416 | 6,416
Net additions | 184 | 0
Amortization | 0 | 0
Other | 0 | 0
Net carrying amount | 6,600 | 6,416
Broadcast licences |  |
Reconciliation of changes in intangible assets and goodwill [abstract] |  |
Net carrying amount | 230 | 225
Net additions | 11 | 0
Amortization | 0 | 0
Other | (11) | 5
Net carrying amount | 230 | 230
Brand names |  |
Reconciliation of changes in intangible assets and goodwill [abstract] |  |
Net carrying amount | 136 | 136
Net additions | 0 | 0
Amortization | 0 | 0
Other | 0 | 0
Net carrying amount | CAD 136 | CAD 136

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- Definition The amount of additions to intangible assets other than goodwill, other than those acquired through business combinations. [Refer: Business combinations [member]; Intangible assets other than goodwill] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 38 -IssueDate 2017-01-01 -Paragraph 118 -Subparagraph e -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=38&date=2017-03-01&anchor=para_118_e_i&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of amortisation of intangible assets other than goodwill. [Refer: Depreciation and amortisation expense; Intangible assets other than goodwill] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 38 -IssueDate 2017-01-01 -Paragraph 118 -Subparagraph e -Clause vi -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=38&date=2017-03-01&anchor=para_118_e_vi&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The increase (decrease) in intangible assets and goodwill resulting from changes that the entity does not separately disclose in the same statement or note. [Refer: Intangible assets and goodwill] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 38 -IssueDate 2017-01-01 -Paragraph 118 -Subparagraph e -Clause viii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=38&date=2017-03-01&anchor=para_118_e_viii&doctype=Standard -URIDate 2017-03-09 + Details
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