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PROPERTY, PLANT AND EQUIPMENT - Changes in Net Carrying Amounts of Property, Plant and Equipment (Details) - CAD CAD in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Reconciliation of changes in property, plant and equipment [abstract] |  |
Property, plant and equipment | CAD 10,749 | CAD 10,997
Additions 1 | 2,510 | 2,352
Depreciation | (2,087) | (2,183)
Impairment |  | (412)
Other | (29) | (5)
Property, plant and equipment | 11,143 | 10,749
Land and buildings |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Property, plant and equipment | 687 | 651
Additions 1 | 61 | 64
Depreciation | (30) | (28)
Impairment |  | 0
Other | (25) | 0
Property, plant and equipment | 693 | 687
Cable and wireless network |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Property, plant and equipment | 7,073 | 7,321
Additions 1 | 1,125 | 1,173
Depreciation | (1,150) | (1,216)
Impairment |  | (205)
Other | (2) | 0
Property, plant and equipment | 7,046 | 7,073
Computer equipment and software |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Property, plant and equipment | 1,872 | 1,873
Additions 1 | 867 | 732
Depreciation | (549) | (522)
Impairment |  | (207)
Other | (1) | (4)
Property, plant and equipment | 2,189 | 1,872
Communication and network equipment [member] |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Property, plant and equipment | 404 | 461
Additions 1 | 315 | 240
Depreciation | (244) | (296)
Impairment |  | 0
Other | 0 | (1)
Property, plant and equipment | 475 | 404
Leasehold improvements |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Property, plant and equipment | 264 | 248
Additions 1 | 40 | 46
Depreciation | (28) | (30)
Impairment |  | 0
Other | 0 | 0
Property, plant and equipment | 276 | 264
Equipment and vehicles |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Property, plant and equipment | 449 | 443
Additions 1 | 102 | 97
Depreciation | (86) | (91)
Impairment |  | 0
Other | (1) | 0
Property, plant and equipment | CAD 464 | CAD 449

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- Definition The amount of additions to property, plant and equipment other than those acquired through business combinations. [Refer: Business combinations [member]; Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2017-01-01 -Paragraph 73 -Subparagraph e -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2017-03-01&anchor=para_73_e_i&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of depreciation of property, plant and equipment. [Refer: Depreciation and amortisation expense; Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2017-01-01 -Paragraph 73 -Subparagraph e -Clause vii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2017-03-01&anchor=para_73_e_vii&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2017-01-01 -Paragraph 75 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2017-03-01&anchor=para_75_a&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of impairment loss recognised in profit or loss for property, plant and equipment. [Refer: Impairment loss recognised in profit or loss; Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2017-01-01 -Paragraph 73 -Subparagraph e -Clause v -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2017-03-01&anchor=para_73_e_v&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 98 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_98_a&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The increase (decrease) in property, plant and equipment resulting from changes that the entity does not separately disclose in the same statement or note. [Refer: Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2017-01-01 -Paragraph 73 -Subparagraph e -Clause ix -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2017-03-01&anchor=para_73_e_ix&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of tangible assets that: (a) are held for use in the production or supply of goods or services, for rental to others, or for administrative purposes; and (b) are expected to be used during more than one period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2017-01-01 -Paragraph 73 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2017-03-01&anchor=para_73_e&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 54 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_54_a&doctype=Standard -URIDate 2017-03-09 + Details
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