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Property, plant and equipment - Disclosure of detailed information about property, plant and equipment (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Reconciliation of changes in property, plant and equipment [abstract] |  |
Property, plant and equipment, beginning balance | $ (22,346) | $ (21,630)
Property, plant and equipment, ending balance | (24,033) | (22,346)
COST |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Property, plant and equipment, beginning balance | (65,626) | (63,694)
Additions | 4,149 | 3,896
Acquisition through business combinations | 993 | 315
Transfers | (411) | (598)
Retirements and disposals | (1,127) | (1,680)
Impairment losses recognized in earnings |  | (1)
Property, plant and equipment, ending balance | (69,230) | (65,626)
ACCUMULATED DEPRECIATION |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Property, plant and equipment, beginning balance | 43,280 | 42,064
Retirements and disposals | (1,073) | (1,626)
Depreciation | 3,037 | 2,877
Other | (47) | (35)
Property, plant and equipment, ending balance | 45,197 | 43,280
NETWORK INFRASTRUCTURE AND EQUIPMENT |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Property, plant and equipment, beginning balance | (18,447) | (18,050)
Property, plant and equipment, ending balance | (19,539) | (18,447)
NETWORK INFRASTRUCTURE AND EQUIPMENT | COST |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Property, plant and equipment, beginning balance | (58,680) | (57,233)
Additions | 2,492 | 2,361
Acquisition through business combinations | 653 | 32
Transfers | 775 | 692
Retirements and disposals | (1,105) | (1,637)
Impairment losses recognized in earnings |  | (1)
Property, plant and equipment, ending balance | (61,495) | (58,680)
NETWORK INFRASTRUCTURE AND EQUIPMENT | ACCUMULATED DEPRECIATION |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Property, plant and equipment, beginning balance | 40,233 | 39,183
Retirements and disposals | (1,054) | (1,591)
Depreciation | 2,816 | 2,672
Other | (39) | (31)
Property, plant and equipment, ending balance | 41,956 | 40,233
LAND AND BUILDINGS |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Property, plant and equipment, beginning balance | (2,525) | (2,293)
Property, plant and equipment, ending balance | (2,720) | (2,525)
LAND AND BUILDINGS | COST |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Property, plant and equipment, beginning balance | (5,572) | (5,174)
Additions | 70 | 120
Acquisition through business combinations | 264 | 282
Transfers | 77 | 35
Retirements and disposals | (22) | (39)
Impairment losses recognized in earnings |  | 0
Property, plant and equipment, ending balance | (5,961) | (5,572)
LAND AND BUILDINGS | ACCUMULATED DEPRECIATION |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Property, plant and equipment, beginning balance | 3,047 | 2,881
Retirements and disposals | (19) | (35)
Depreciation | 221 | 205
Other | (8) | (4)
Property, plant and equipment, ending balance | 3,241 | 3,047
ASSETS UNDER CONSTRUCTION |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Property, plant and equipment, beginning balance | (1,374) | (1,287)
Property, plant and equipment, ending balance | (1,774) | (1,374)
ASSETS UNDER CONSTRUCTION | COST |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Property, plant and equipment, beginning balance | (1,374) | (1,287)
Additions | 1,587 | 1,415
Acquisition through business combinations | 76 | 1
Transfers | (1,263) | (1,325)
Retirements and disposals | 0 | (4)
Impairment losses recognized in earnings |  | 0
Property, plant and equipment, ending balance | (1,774) | (1,374)
ASSETS UNDER CONSTRUCTION | ACCUMULATED DEPRECIATION |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Property, plant and equipment, beginning balance | 0 | 0
Retirements and disposals | 0 | 0
Depreciation | 0 | 0
Other | 0 | 0
Property, plant and equipment, ending balance | $ 0 | $ 0

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- Definition The increase in property, plant and equipment resulting from acquisitions 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 iii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2017-03-01&anchor=para_73_e_iii&doctype=Standard -URIDate 2017-03-09 + Details
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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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