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Income taxes - Deferred Taxes Resulting From Temporary Differences (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Deferred tax liability (asset) | $ (4,574) | $ (3,704)
Income statement | (188) | (226)
Business acquisitions | (43) | (4)
Other comprehensive income | (73) | (677)
Deficit | (7) | 30
Reclassified to liabilities held for sale |  | 5
Other | 16 | 2
Deferred tax liability (asset) | (4,869) | (4,574)
NON- CAPITAL LOSS CARRY- FORWARDS |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Deferred tax liability (asset) | 63 | 69
Income statement | (4) | (10)
Business acquisitions | 1 | 4
Deferred tax liability (asset) | 60 | 63
POST- EMPLOYMENT BENEFIT PLANS |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Deferred tax liability (asset) | (466) | 185
Income statement | 15 | 2
Other comprehensive income | (151) | (653)
Deferred tax liability (asset) | (602) | (466)
INDEFINITE- LIFE INTANGIBLE ASSETS |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Deferred tax liability (asset) | (1,701) | (1,717)
Income statement | (40) | 16
Business acquisitions | (26) |
Deferred tax liability (asset) | (1,767) | (1,701)
PROPERTY, PLANT AND EQUIPMENT AND FINITE- LIFE INTANGIBLE ASSETS |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Deferred tax liability (asset) | (2,417) | (2,175)
Income statement | (307) | (253)
Business acquisitions | (21) | (9)
Deficit |  | 16
Reclassified to liabilities held for sale |  | 4
Deferred tax liability (asset) | (2,745) | (2,417)
OTHER |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Deferred tax liability (asset) | (53) | (66)
Income statement | 148 | 19
Business acquisitions | 3 | 1
Other comprehensive income | 78 | (24)
Deficit | (7) | 14
Reclassified to liabilities held for sale |  | 1
Other | 16 | 2
Deferred tax liability (asset) | $ 185 | $ (53)

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- Definition Increase (decrease) through other, deferred tax liability (asset) + References No definition available. + Details
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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 2022-03-24 -Paragraph 84 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=37&code=ifrs-tx-2022-en-r&anchor=para_84&doctype=Standard -URIDate 2022-03-24 + 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 2022-03-24 -Paragraph 81 -Subparagraph g -Clause ii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=12&code=ifrs-tx-2022-en-r&anchor=para_81_g_ii&doctype=Standard -URIDate 2022-03-24 + Details
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