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Income taxes - Net deferred tax liability (Details) - CAD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Mar. 17, 2017
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |  |
Deferred tax liability (asset) | $ (2,103) | $ (1,735) |
Income statement | (312) | (259) |
Business acquisitions | 12 | (75) |
Other comprehensive income | 103 | (32) |
Deficit | 2 | 6 |
Other | (5) | (8) |
Deferred tax liability (asset) | (2,303) | (2,103) |
Unused tax losses for which no deferred tax asset recognised |  | 144 |
NON- CAPITAL LOSS CARRY- FORWARDS |  |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |  |
Deferred tax liability (asset) | 21 | 12 |
Income statement | (304) | (1) |
Business acquisitions | 300 | 10 |
Deferred tax liability (asset) | 17 | 21 |
Unused tax loss carryforward | 208 | 221 |
Unused tax losses for which no deferred tax asset recognised | 144 |  |
POST EMPLOYMENT BENEFIT PLANS |  |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |  |
Deferred tax liability (asset) | 454 | 520 |
Income statement | (31) | (28) |
Business acquisitions | (11) |  |
Other comprehensive income | 82 | (38) |
Deferred tax liability (asset) | 494 | 454 |
INDEFINITE- LIFE INTANGIBLE ASSETS |  |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |  |
Deferred tax liability (asset) | (1,680) | (1,619) |
Income statement | (8) | (61) |
Business acquisitions | (73) |  |
Deferred tax liability (asset) | (1,761) | (1,680) |
PROPERTY, PLANT AND EQUIPMENT AND FINITE- LIFE INTANGIBLE ASSETS |  |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |  |
Deferred tax liability (asset) | (1,199) | (968) |
Income statement | 12 | (152) |
Business acquisitions | (223) | (79) |
Other | (3) |  |
Deferred tax liability (asset) | (1,413) | (1,199) |
INVESTMENT TAX CREDITS |  |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |  |
Deferred tax liability (asset) | (9) | (6) |
Income statement | 7 | (3) |
Business acquisitions | (5) |  |
Deferred tax liability (asset) | (7) | (9) |
CRTC TANGIBLE BENEFITS |  |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |  |
Deferred tax liability (asset) | 44 | 61 |
Income statement | (14) | (17) |
Deferred tax liability (asset) | 30 | 44 |
OTHER |  |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |  |
Deferred tax liability (asset) | 266 | 265 |
Income statement | 26 | 3 |
Business acquisitions | 24 | (6) |
Other comprehensive income | 21 | 6 |
Deficit | 2 | 6 |
Other | (2) | (8) |
Deferred tax liability (asset) | 337 | 266 |
CAPITAL LOSS CARRYFORWARD |  |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |  |
Unused tax loss carryforward | 827 | 765 |
MTS | NON- CAPITAL LOSS CARRY- FORWARDS |  |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |  |
Unused tax loss carryforward | 64 |  | $ 1,500
Q9 | NON- CAPITAL LOSS CARRY- FORWARDS |  |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |  |
Deferred tax liability (asset) | $ 11 |  |
Deferred tax liability (asset) |  | 11 |
Unused tax loss carryforward |  | $ 77 |

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