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PROPERTY, PLANT AND EQUIPMENT - Cost, Depreciation, Net Carrying Amount (Details) - CAD CAD in Millions | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
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Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment | CAD 11,143 | CAD 10,749 | CAD 10,997
Cost prior to impairment losses |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment | 29,645 | 28,652 | 30,584
Accumulated amortization |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment | (18,502) | (17,903) | (19,587)
Land and buildings |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment | 693 | 687 | 651
Land and buildings | Cost prior to impairment losses |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment | 1,090 | 1,062 | 998
Land and buildings | Accumulated amortization |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment | (397) | (375) | (347)
Cable and wireless network |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment | 7,046 | 7,073 | 7,321
Cable and wireless network | Cost prior to impairment losses |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment | 20,252 | 20,108 | 20,900
Cable and wireless network | Accumulated amortization |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment | (13,206) | (13,035) | (13,579)
Computer equipment and software |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment | 2,189 | 1,872 | 1,873
Computer equipment and software | Cost prior to impairment losses |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment | 4,996 | 4,296 | 5,294
Computer equipment and software | Accumulated amortization |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment | (2,807) | (2,424) | (3,421)
Customer premise equipment |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment | 475 | 404 | 461
Customer premise equipment | Cost prior to impairment losses |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment | 1,565 | 1,560 | 1,658
Customer premise equipment | Accumulated amortization |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment | (1,090) | (1,156) | (1,197)
Leasehold improvements |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment | 276 | 264 | 248
Leasehold improvements | Cost prior to impairment losses |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment | 496 | 457 | 423
Leasehold improvements | Accumulated amortization |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment | (220) | (193) | (175)
Equipment and vehicles |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment | 464 | 449 | 443
Equipment and vehicles | Cost prior to impairment losses |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment | 1,246 | 1,169 | 1,311
Equipment and vehicles | Accumulated amortization |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment | CAD (782) | CAD (720) | CAD (868)

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + 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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