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Income taxes - Deferred Taxes Resulting From Temporary Differences (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Deferred tax liability (asset) | $ (3,463) |
Income statement | (114) | $ (396)
Business acquisitions | 26 | (2)
Other comprehensive income | (172) | (90)
Deficit | (20) | 13
Discontinued operations | 30 | (4)
Other | 9 | 60
Deferred tax liability (asset) | (3,704) | (3,463)
Increase (decrease) through other, deferred tax liability (asset) | (9) | (60)
Increase (decrease) through business combinations, deferred tax liability (asset) | (26) | 2
NON- CAPITAL LOSS CARRY- FORWARDS |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Deferred tax liability (asset) | 31 |
Income statement | 13 | (105)
Business acquisitions | 25 | 5
Other | 0 | 2
Deferred tax liability (asset) | 69 | 31
Increase (decrease) through other, deferred tax liability (asset) | 0 | (2)
Increase (decrease) through business combinations, deferred tax liability (asset) | (25) | (5)
POST- EMPLOYMENT BENEFIT PLANS |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Deferred tax liability (asset) | 364 |
Income statement | 5 | 3
Other comprehensive income | (184) | (54)
Deferred tax liability (asset) | 185 | 364
INDEFINITE- LIFE INTANGIBLE ASSETS |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Deferred tax liability (asset) | (1,763) |
Income statement | 46 | 0
Deferred tax liability (asset) | (1,717) | (1,763)
PROPERTY, PLANT AND EQUIPMENT AND FINITE- LIFE INTANGIBLE ASSETS |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Deferred tax liability (asset) | (1,779) |
Income statement | (426) | (173)
Business acquisitions | 0 | (6)
Discontinued operations | 30 | (4)
Other | 0 | 46
Deferred tax liability (asset) | (2,175) | (1,779)
Increase (decrease) through other, deferred tax liability (asset) | 0 | (46)
Increase (decrease) through business combinations, deferred tax liability (asset) | 0 | 6
CRTC TANGIBLE BENEFITS |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Deferred tax liability (asset) | 7 |
Income statement | (7) | (9)
Business acquisitions |  | 0
Deferred tax liability (asset) | 0 | 7
Increase (decrease) through business combinations, deferred tax liability (asset) |  | 0
OTHER |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Deferred tax liability (asset) | (323) |
Income statement | 255 | (112)
Business acquisitions | 1 | (1)
Other comprehensive income | 12 | (36)
Deficit | (20) | 13
Other | 9 | 12
Deferred tax liability (asset) | (66) | (323)
Increase (decrease) through other, deferred tax liability (asset) | (9) | (12)
Increase (decrease) through business combinations, deferred tax liability (asset) | $ (1) | $ 1

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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 2020-01-01 -Paragraph 81 -Subparagraph g -Clause ii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2020-en-r&anchor=para_81_g_ii&doctype=Standard -URIDate 2020-01-01 + Details
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