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Committments and contingencies (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Disclosure of contingent liabilities [line items] |  |
Operating leases | $ 1,436 |
Commitments for property, plant and equipment and intangible assets | 4,157 |
Purchase obligations | 3,909 |
Proposed acquisition of Séries and Historia specialty channels | 200 |
Acquisition of AlarmForce (1) | 182 |
Total | 9,884 |
Operating leases, rent expense | $ 399 | $ 353
Bottom of range |  |
Disclosure of contingent liabilities [line items] |  |
Operating leases, term of contract | 1 year |
Top of range |  |
Disclosure of contingent liabilities [line items] |  |
Operating leases, term of contract | 50 years |
2018 |  |
Disclosure of contingent liabilities [line items] |  |
Operating leases | $ 312 |
Commitments for property, plant and equipment and intangible assets | 1,039 |
Purchase obligations | 865 |
Proposed acquisition of Séries and Historia specialty channels | 200 |
Acquisition of AlarmForce (1) | 182 |
Total | 2,598 |
2019 |  |
Disclosure of contingent liabilities [line items] |  |
Operating leases | 264 |
Commitments for property, plant and equipment and intangible assets | 808 |
Purchase obligations | 664 |
Proposed acquisition of Séries and Historia specialty channels | 0 |
Acquisition of AlarmForce (1) | 0 |
Total | 1,736 |
2020 |  |
Disclosure of contingent liabilities [line items] |  |
Operating leases | 225 |
Commitments for property, plant and equipment and intangible assets | 614 |
Purchase obligations | 550 |
Proposed acquisition of Séries and Historia specialty channels | 0 |
Acquisition of AlarmForce (1) | 0 |
Total | 1,389 |
2021 |  |
Disclosure of contingent liabilities [line items] |  |
Operating leases | 175 |
Commitments for property, plant and equipment and intangible assets | 516 |
Purchase obligations | 498 |
Proposed acquisition of Séries and Historia specialty channels | 0 |
Acquisition of AlarmForce (1) | 0 |
Total | 1,189 |
2022 |  |
Disclosure of contingent liabilities [line items] |  |
Operating leases | 119 |
Commitments for property, plant and equipment and intangible assets | 372 |
Purchase obligations | 429 |
Proposed acquisition of Séries and Historia specialty channels | 0 |
Acquisition of AlarmForce (1) | 0 |
Total | 920 |
THEREAFTER |  |
Disclosure of contingent liabilities [line items] |  |
Operating leases | 341 |
Commitments for property, plant and equipment and intangible assets | 808 |
Purchase obligations | 903 |
Proposed acquisition of Séries and Historia specialty channels | 0 |
Acquisition of AlarmForce (1) | 0 |
Total | $ 2,052 |

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