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property, plant and equipment (Tables) | 12 Months Ended
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Dec. 31, 2018
property, plant and equipment |
Schedule of property, plant and equipment |
|  |  |  |  |  |  | Buildings and |  |  |  |  |  |  |  |  |  |  |  |
|  |  |  | Network |  | leasehold |  |  |  |  |  |  |  | Assets under |  |  |
(millions) |  | Note |  | assets 1 |  | improvements |  | Other 1 |  | Land |  | construction |  | Total
At cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
As at January 1, 2017 |  |  |  | $ | 28,284 |  | $ | 2,954 |  | $ | 1,021 |  | $ | 55 |  | $ | 592 |  | $ | 32,906
Additions 2 |  |  |  |  | 972 |  |  | 51 |  |  | 44 |  |  | — |  |  | 1,426 |  |  | 2,493
Additions arising from business acquisitions |  |  |  |  | 25 |  |  | 8 |  |  | 9 |  |  | — |  |  | — |  |  | 42
Dispositions, retirements and other |  |  |  |  | (1,724) |  |  | (63) |  |  | (48) |  |  | (7) |  |  | — |  |  | (1,842)
Assets under construction put into service |  |  |  |  | 1,167 |  |  | 127 |  |  | 69 |  |  | — |  |  | (1,363) |  |  | —
As at December 31, 2017 |  |  |  |  | 28,724 |  |  | 3,077 |  |  | 1,095 |  |  | 48 |  |  | 655 |  |  | 33,599
Additions 2 |  |  |  |  | 1,039 |  |  | 27 |  |  | 37 |  |  | — |  |  | 1,265 |  |  | 2,368
Additions arising from business acquisitions |  | 18(b) |  |  | 4 |  |  | 13 |  |  | 9 |  |  | — |  |  | — |  |  | 26
Dispositions, retirements and other |  |  |  |  | (767) |  |  | 56 |  |  | (52) |  |  | — |  |  | — |  |  | (763)
Assets under construction put into service |  |  |  |  | 956 |  |  | 100 |  |  | 85 |  |  | — |  |  | (1,141) |  |  | —
As at December 31, 2018 |  |  |  | $ | 29,956 |  | $ | 3,273 |  | $ | 1,174 |  | $ | 48 |  | $ | 779 |  | $ | 35,230
Accumulated depreciation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
As at January 1, 2017 |  |  |  | $ | 19,950 |  | $ | 1,836 |  | $ | 656 |  | $ | — |  | $ | — |  | $ | 22,442
Depreciation |  |  |  |  | 1,396 |  |  | 106 |  |  | 115 |  |  | — |  |  | — |  |  | 1,617
Dispositions, retirements and other |  |  |  |  | (1,708) |  |  | (58) |  |  | (62) |  |  | — |  |  | — |  |  | (1,828)
As at December 31, 2017 |  |  |  |  | 19,638 |  |  | 1,884 |  |  | 709 |  |  | — |  |  | — |  |  | 22,231
Depreciation |  |  |  |  | 1,431 |  |  | 115 |  |  | 123 |  |  | — |  |  | — |  |  | 1,669
Dispositions, retirements and other |  |  |  |  | (769) |  |  | 51 |  |  | (43) |  |  | — |  |  | — |  |  | (761)
As at December 31, 2018 |  |  |  | $ | 20,300 |  | $ | 2,050 |  | $ | 789 |  | $ | — |  | $ | — |  | $ | 23,139
Net book value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
As at December 31, 2017 |  |  |  | $ | 9,086 |  | $ | 1,193 |  | $ | 386 |  | $ | 48 |  | $ | 655 |  | $ | 11,368
As at December 31, 2018 |  |  |  | $ | 9,656 |  | $ | 1,223 |  | $ | 385 |  | $ | 48 |  | $ | 779 |  | $ | 12,091
| 1 |  | As at December 31, 2018, the net carrying amount of assets under finance leases included in network assets was $100 (2017 – $NIL) and included in other was $1 (2017 – $NIL).
| 2 |  | For the year ended December 31, 2018, additions include $(15) (2017 – $7) in respect of asset retirement obligations (see Note 25).

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