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property, plant and equipment (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
property, plant and equipment |  |
Property, plant and equipment at beginning of period | $ 11,368 |
Depreciation | 1,669 | $ 1,617
Property, plant and equipment at end of period | 12,091 | 11,368
Additions in respect of asset retirement obligations | (15) | 7
Contractual commitments for the acquisition of property, plant and equipment | 177 | 184
Network assets |  |
property, plant and equipment |  |
Property, plant and equipment at beginning of period | 9,086 |
Property, plant and equipment at end of period | 9,656 | 9,086
Additions in respect of assets under finance lease | 100 | 0
Buildings and leasehold improvements |  |
property, plant and equipment |  |
Property, plant and equipment at beginning of period | 1,193 |
Property, plant and equipment at end of period | 1,223 | 1,193
Other |  |
property, plant and equipment |  |
Property, plant and equipment at beginning of period | 386 |
Property, plant and equipment at end of period | 385 | 386
Additions in respect of assets under finance lease | 1 | 0
Land |  |
property, plant and equipment |  |
Property, plant and equipment at beginning of period | 48 |
Property, plant and equipment at end of period | 48 | 48
Assets under construction |  |
property, plant and equipment |  |
Property, plant and equipment at beginning of period | 655 |
Property, plant and equipment at end of period | 779 | 655
Cost/Gross amount |  |
property, plant and equipment |  |
Property, plant and equipment at beginning of period | 33,599 | 32,906
Additions | 2,368 | 2,493
Additions arising from business acquisitions | 26 | 42
Dispositions, retirements and other | (763) | (1,842)
Property, plant and equipment at end of period | 35,230 | 33,599
Cost/Gross amount | Network assets |  |
property, plant and equipment |  |
Property, plant and equipment at beginning of period | 28,724 | 28,284
Additions | 1,039 | 972
Additions arising from business acquisitions | 4 | 25
Dispositions, retirements and other | (767) | (1,724)
Assets under construction put into service | 956 | 1,167
Property, plant and equipment at end of period | 29,956 | 28,724
Cost/Gross amount | Buildings and leasehold improvements |  |
property, plant and equipment |  |
Property, plant and equipment at beginning of period | 3,077 | 2,954
Additions | 27 | 51
Additions arising from business acquisitions | 13 | 8
Dispositions, retirements and other | 56 | (63)
Assets under construction put into service | 100 | 127
Property, plant and equipment at end of period | 3,273 | 3,077
Cost/Gross amount | Other |  |
property, plant and equipment |  |
Property, plant and equipment at beginning of period | 1,095 | 1,021
Additions | 37 | 44
Additions arising from business acquisitions | 9 | 9
Dispositions, retirements and other | (52) | (48)
Assets under construction put into service | 85 | 69
Property, plant and equipment at end of period | 1,174 | 1,095
Cost/Gross amount | Land |  |
property, plant and equipment |  |
Property, plant and equipment at beginning of period | 48 | 55
Dispositions, retirements and other |  | (7)
Property, plant and equipment at end of period | 48 | 48
Cost/Gross amount | Assets under construction |  |
property, plant and equipment |  |
Property, plant and equipment at beginning of period | 655 | 592
Additions | 1,265 | 1,426
Assets under construction put into service | (1,141) | (1,363)
Property, plant and equipment at end of period | 779 | 655
Accumulated depreciation |  |
property, plant and equipment |  |
Property, plant and equipment at beginning of period | (22,231) | (22,442)
Depreciation | 1,669 | 1,617
Dispositions, retirements and other | 761 | 1,828
Property, plant and equipment at end of period | (23,139) | (22,231)
Accumulated depreciation | Network assets |  |
property, plant and equipment |  |
Property, plant and equipment at beginning of period | (19,638) | (19,950)
Depreciation | 1,431 | 1,396
Dispositions, retirements and other | 769 | 1,708
Property, plant and equipment at end of period | (20,300) | (19,638)
Accumulated depreciation | Buildings and leasehold improvements |  |
property, plant and equipment |  |
Property, plant and equipment at beginning of period | (1,884) | (1,836)
Depreciation | 115 | 106
Dispositions, retirements and other | (51) | 58
Property, plant and equipment at end of period | (2,050) | (1,884)
Accumulated depreciation | Other |  |
property, plant and equipment |  |
Property, plant and equipment at beginning of period | (709) | (656)
Depreciation | 123 | 115
Dispositions, retirements and other | 43 | 62
Property, plant and equipment at end of period | $ (789) | $ (709)

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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 2018-01-01 -Paragraph 73 -Subparagraph e -Clause iii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2018-03-01&anchor=para_73_e_iii&doctype=Standard -URIDate 2018-03-16 + 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 2018-01-01 -Paragraph 73 -Subparagraph e -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2018-03-01&anchor=para_73_e_i&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of contractual commitments for the acquisition of property, plant and equipment. [Refer: Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2018-01-01 -Paragraph 74 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2018-03-01&anchor=para_74_c&doctype=Standard -URIDate 2018-03-16 + 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 2018-01-01 -Paragraph 73 -Subparagraph e -Clause vii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2018-03-01&anchor=para_73_e_vii&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2018-01-01 -Paragraph 75 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2018-03-01&anchor=para_75_a&doctype=Standard -URIDate 2018-03-16 + 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 2018-01-01 -Paragraph 73 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2018-03-01&anchor=para_73_e&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 54 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_54_a&doctype=Standard -URIDate 2018-03-16 + Details
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