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Income taxes - Deferred Taxes Resulting From Temporary Differences (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Deferred tax liability (asset) | $ (3,704) | $ (3,463)
Income statement | (226) | (114)
Business acquisitions | (4) | 26
Other comprehensive income | (677) | (172)
Deficit | 30 | (20)
Discontinued operations |  | 30
Reclassified to liabilities held for sale | 5 |
Other | 2 | 9
Deferred tax liability (asset) | (4,574) | (3,704)
NON- CAPITAL LOSS CARRY- FORWARDS |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Deferred tax liability (asset) | 69 | 31
Income statement | (10) | 13
Business acquisitions | 4 | 25
Other | 0 | 0
Deferred tax liability (asset) | 63 | 69
POST- EMPLOYMENT BENEFIT PLANS |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Deferred tax liability (asset) | 185 | 364
Income statement | 2 | 5
Other comprehensive income | (653) | (184)
Deferred tax liability (asset) | (466) | 185
INDEFINITE- LIFE INTANGIBLE ASSETS |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Deferred tax liability (asset) | (1,717) | (1,763)
Income statement | 16 | 46
Deferred tax liability (asset) | (1,701) | (1,717)
PROPERTY, PLANT AND EQUIPMENT AND FINITE- LIFE INTANGIBLE ASSETS |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Deferred tax liability (asset) | (2,175) | (1,779)
Income statement | (253) | (426)
Business acquisitions | (9) | 0
Deficit | 16 |
Discontinued operations |  | 30
Reclassified to liabilities held for sale | 4 |
Other | 0 | 0
Deferred tax liability (asset) | (2,417) | (2,175)
CRTC TANGIBLE BENEFITS |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Deferred tax liability (asset) | 0 | 7
Income statement | 0 | (7)
Business acquisitions |  | 0
Deferred tax liability (asset) | 0 | 0
OTHER |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Deferred tax liability (asset) | (66) | (323)
Income statement | 19 | 255
Business acquisitions | 1 | 1
Other comprehensive income | (24) | 12
Deficit | 14 | (20)
Reclassified to liabilities held for sale | 1 |
Other | 2 | 9
Deferred tax liability (asset) | $ (53) | $ (66)

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- Definition The decrease in other provisions resulting from the transfer of those provisions to liabilities included in disposal groups classified as held for sale. [Refer: Other provisions; Disposal groups classified as held for sale [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 37 -IssueDate 2021-01-01 -Paragraph 84 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=37&code=ifrs-tx-2021-en-r&anchor=para_84&doctype=Standard -URIDate 2021-03-24 + 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 2021-01-01 -Paragraph 81 -Subparagraph g -Clause ii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2021-en-r&anchor=para_81_g_ii&doctype=Standard -URIDate 2021-03-24 + Details
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