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Income taxes - Deferred Taxes Resulting From Temporary Differences (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Beginning balance, deferred tax liability (asset) | $ (4,773) | $ (4,869)
Income statements | (95) | (90)
Business acquisitions/business dispositions | (94) | (18)
Other comprehensive income | (128) | 199
Deficit | (26) | (8)
Reclassified to liabilities held for sale |  | 6
Other | 8 | 7
Ending balance, deferred tax liability (asset) | (5,108) | (4,773)
Non-capital loss carry-forwards |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Beginning balance, deferred tax liability (asset) | 36 | 60
Income statements | 31 | (23)
Business acquisitions/business dispositions |  | (1)
Ending balance, deferred tax liability (asset) | 73 | 36
Post-employment benefit plans |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Beginning balance, deferred tax liability (asset) | (443) | (602)
Income statements | 25 | 10
Business acquisitions/business dispositions | (3) |
Other comprehensive income | (213) | 149
Ending balance, deferred tax liability (asset) | (634) | (443)
Indefinite-life intangible assets |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Beginning balance, deferred tax liability (asset) | (1,805) | (1,767)
Income statements | 148 | (35)
Business acquisitions/business dispositions | (5) | (10)
Reclassified to liabilities held for sale |  | 7
Ending balance, deferred tax liability (asset) | (1,662) | (1,805)
Property, plant and equipment and finite-life intangible assets |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Beginning balance, deferred tax liability (asset) | (2,781) | (2,745)
Income statements | (315) | (36)
Business acquisitions/business dispositions | (84) | (4)
Reclassified to liabilities held for sale |  | (1)
Other | 2 | 5
Ending balance, deferred tax liability (asset) | (3,178) | (2,781)
Other |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Beginning balance, deferred tax liability (asset) | 220 | 185
Income statements | 16 | (6)
Business acquisitions/business dispositions | (2) | (3)
Other comprehensive income | 85 | 50
Deficit | (26) | (8)
Other |  | 2
Ending balance, deferred tax liability (asset) | $ 293 | $ 220

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- Definition Increase (Decrease) Through Transfer To Held-For-Sale, 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 2024-01-01 -Paragraph 81 -Subparagraph g -Clause ii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=12&code=ifrs-tx-2024-en-r&anchor=para_81_g_ii&doctype=Standard -URIDate 2024-03-27 + 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 2024-01-01 -Paragraph 81 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=12&code=ifrs-tx-2024-en-r&anchor=para_81&doctype=Standard -URIDate 2024-03-27 + Details
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