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intangible assets and goodwill (Details) - CAD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Jan. 01, 2017
intangible assets and goodwill |  |  |
Balance at beginning of the period | $ 14,894 |  |
Amortization | (598) | $ (552) |
Balance at end of the period | 15,689 | 14,894 |
Goodwill | 4,733 | 4,236 | $ 3,787
Contractual commitments for the acquisition of intangible assets | 59 | 36 |
Cost/Gross amount |  |  |
intangible assets and goodwill |  |  |
Balance at beginning of the period | 18,959 | 17,929 |
Additions | 657 | 617 |
Additions arising from business acquisitions | 694 | 687 |
Dispositions, retirements and other | (385) | (271) |
Net foreign exchange differences | 40 | (3) |
Balance at end of the period | 19,965 | 18,959 |
Accumulated amortization |  |  |
intangible assets and goodwill |  |  |
Balance at beginning of the period | (4,065) | (3,778) |
Amortization | (598) | (552) |
Dispositions, retirements and other | (387) | (265) |
Balance at end of the period | (4,276) | (4,065) |
Allowance for doubtful accounts |  |  |
intangible assets and goodwill |  |  |
Goodwill | 0 |  |
Spectrum licences |  |  |
intangible assets and goodwill |  |  |
Balance at beginning of the period | 8,693 |  |
Balance at end of the period | $ 8,694 | 8,693 |
Renewal of spectrum license ( in years) | 20 years |  |
Spectrum licences | Cost/Gross amount |  |  |
intangible assets and goodwill |  |  |
Balance at beginning of the period | $ 8,693 | 8,693 |
Additions | 1 |  |
Balance at end of the period | 8,694 | 8,693 |
Total intangible assets |  |  |
intangible assets and goodwill |  |  |
Balance at beginning of the period | 10,658 |  |
Balance at end of the period | 10,956 | 10,658 |
Total intangible assets | Cost/Gross amount |  |  |
intangible assets and goodwill |  |  |
Balance at beginning of the period | 14,359 | 13,778 |
Additions | 657 | 617 |
Additions arising from business acquisitions | 238 | 235 |
Dispositions, retirements and other | (385) | (271) |
Net foreign exchange differences | (1) |  |
Balance at end of the period | 14,868 | 14,359 |
Total intangible assets | Accumulated amortization |  |  |
intangible assets and goodwill |  |  |
Balance at beginning of the period | (3,701) | (3,414) |
Amortization | (598) | (552) |
Dispositions, retirements and other | (387) | (265) |
Balance at end of the period | (3,912) | (3,701) |
Intangible assets subject to amortization |  |  |
intangible assets and goodwill |  |  |
Balance at beginning of the period | 1,965 |  |
Balance at end of the period | 2,262 | 1,965 |
Intangible assets subject to amortization | Cost/Gross amount |  |  |
intangible assets and goodwill |  |  |
Balance at beginning of the period | 5,666 | 5,085 |
Additions | 656 | 617 |
Additions arising from business acquisitions | 238 | 235 |
Dispositions, retirements and other | (385) | (271) |
Net foreign exchange differences | (1) |  |
Balance at end of the period | 6,174 | 5,666 |
Intangible assets subject to amortization | Accumulated amortization |  |  |
intangible assets and goodwill |  |  |
Balance at beginning of the period | (3,701) | (3,414) |
Amortization | (598) | (552) |
Dispositions, retirements and other | (387) | (265) |
Balance at end of the period | (3,912) | (3,701) |
Customer contracts, related customer relationships and leasehold interests |  |  |
intangible assets and goodwill |  |  |
Balance at beginning of the period | 248 |  |
Balance at end of the period | 412 | 248 |
Customer contracts, related customer relationships and leasehold interests | Cost/Gross amount |  |  |
intangible assets and goodwill |  |  |
Balance at beginning of the period | 558 | 485 |
Additions arising from business acquisitions | 219 | 134 |
Dispositions, retirements and other | (138) | (61) |
Net foreign exchange differences | (1) |  |
Balance at end of the period | 638 | 558 |
Customer contracts, related customer relationships and leasehold interests | Accumulated amortization |  |  |
intangible assets and goodwill |  |  |
Balance at beginning of the period | (310) | (323) |
Amortization | (56) | (48) |
Dispositions, retirements and other | (140) | (61) |
Balance at end of the period | (226) | (310) |
Software |  |  |
intangible assets and goodwill |  |  |
Balance at beginning of the period | 1,337 |  |
Balance at end of the period | 1,471 | 1,337 |
Software | Cost/Gross amount |  |  |
intangible assets and goodwill |  |  |
Balance at beginning of the period | 4,667 | 4,295 |
Additions | 69 | 74 |
Additions arising from business acquisitions | 19 | 101 |
Dispositions, retirements and other | (248) | (209) |
Assets under construction put into service | 585 | 406 |
Balance at end of the period | 5,092 | 4,667 |
Software | Accumulated amortization |  |  |
intangible assets and goodwill |  |  |
Balance at beginning of the period | (3,330) | (3,032) |
Amortization | (538) | (500) |
Dispositions, retirements and other | (247) | (202) |
Balance at end of the period | (3,621) | (3,330) |
Access to rights-of-way and other |  |  |
intangible assets and goodwill |  |  |
Balance at beginning of the period | 36 |  |
Balance at end of the period | 38 | 36 |
Access to rights-of-way and other | Cost/Gross amount |  |  |
intangible assets and goodwill |  |  |
Balance at beginning of the period | 97 | 93 |
Additions | 5 | 5 |
Dispositions, retirements and other | 1 | (1) |
Balance at end of the period | 103 | 97 |
Access to rights-of-way and other | Accumulated amortization |  |  |
intangible assets and goodwill |  |  |
Balance at beginning of the period | (61) | (59) |
Amortization | (4) | (4) |
Dispositions, retirements and other |  | (2) |
Balance at end of the period | (65) | (61) |
Assets under construction |  |  |
intangible assets and goodwill |  |  |
Balance at beginning of the period | 344 |  |
Balance at end of the period | 341 | 344 |
Assets under construction | Cost/Gross amount |  |  |
intangible assets and goodwill |  |  |
Balance at beginning of the period | 344 | 212 |
Additions | 582 | 538 |
Assets under construction put into service | (585) | (406) |
Balance at end of the period | 341 | 344 |
Goodwill |  |  |
intangible assets and goodwill |  |  |
Balance at beginning of the period | 4,236 |  |
Balance at end of the period | 4,733 | 4,236 |
Goodwill | Cost/Gross amount |  |  |
intangible assets and goodwill |  |  |
Balance at beginning of the period | 4,600 | 4,151 |
Additions arising from business acquisitions | 456 | 452 |
Net foreign exchange differences | 41 | (3) |
Balance at end of the period | 5,097 | 4,600 |
Goodwill | Accumulated amortization |  |  |
intangible assets and goodwill |  |  |
Balance at beginning of the period | (364) | (364) |
Balance at end of the period | $ (364) | $ (364) |

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