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Income taxes - Deferred Taxes Resulting From Temporary Differences (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Deferred tax liability (asset) | $ (2,726) | $ (2,496)
Income statement | (240) | (342)
Business acquisitions | (12) | 12
Other comprehensive income | (104) | 103
Deficit | (11) | 2
Other | 42 | (5)
Deferred tax liability (asset) | (3,051) | (2,726)
NON- CAPITAL LOSS CARRY- FORWARDS |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Deferred tax liability (asset) | 17 | 21
Income statement | 109 | (304)
Business acquisitions | 3 | 300
Deferred tax liability (asset) | 129 | 17
POST EMPLOYMENT BENEFIT PLANS |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Deferred tax liability (asset) | 494 | 454
Income statement | (14) | (31)
Business acquisitions |  | (11)
Other comprehensive income | (65) | 82
Deferred tax liability (asset) | 415 | 494
INDEFINITE- LIFE INTANGIBLE ASSETS |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Deferred tax liability (asset) | (1,761) | (1,680)
Income statement | (2) | (8)
Business acquisitions |  | (73)
Deferred tax liability (asset) | (1,763) | (1,761)
PROPERTY, PLANT AND EQUIPMENT AND FINITE- LIFE INTANGIBLE ASSETS |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Deferred tax liability (asset) | (1,400) | (1,198)
Income statement | (248) | 10
Business acquisitions | (16) | (209)
Other | 15 | (3)
Deferred tax liability (asset) | (1,649) | (1,400)
INVESTMENT TAX CREDITS |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Deferred tax liability (asset) | (7) | (9)
Income statement | 3 | 7
Business acquisitions |  | (5)
Deferred tax liability (asset) | (4) | (7)
CRTC TANGIBLE BENEFITS |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Deferred tax liability (asset) | 30 | 44
Income statement | (14) | (14)
Deferred tax liability (asset) | 16 | 30
OTHER |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Deferred tax liability (asset) | (99) | (128)
Income statement | (74) | (2)
Business acquisitions | 1 | 10
Other comprehensive income | (39) | 21
Deficit | (11) | 2
Other | 27 | (2)
Deferred tax liability (asset) | $ (195) | $ (99)

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- Definition Increase (decrease) through other, deferred tax liability (asset) + References No definition available. + Details
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- Definition The amount of tax expense or income relating to changes in deferred tax liabilities and deferred tax assets, recognised in profit or loss. [Refer: Deferred tax assets; Deferred tax expense (income); Deferred tax liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2018-01-01 -Paragraph 81 -Subparagraph g -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2018-03-01&anchor=para_81_g_ii&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of deferred tax liabilities or assets. [Refer: Deferred tax liabilities; Deferred tax assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2018-01-01 -Paragraph 81 -Subparagraph g -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2018-03-01&anchor=para_81_g_i&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The increase (decrease) in deferred tax liability (asset) resulting from business combinations. [Refer: Deferred tax liability (asset)] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 12 -IssueDate 2018-01-01 -Paragraph 81 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2018-03-01&anchor=para_81&doctype=Standard -URIDate 2018-03-16 + Details
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