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Income taxes - Deferred Taxes Resulting From Temporary Differences (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Beginning balance, deferred tax liability (asset) | $ (4,869) | $ (4,574)
Income statements | (90) | (188)
Business acquisitions | (18) | (43)
Other comprehensive (loss)/income | 199 | (73)
Deficit | (8) | (7)
Increase (Decrease) Through Transfer To Held-For-Sale, Deferred Tax Liability (Asset) | 6 |
Other | 7 | 16
Ending balance, deferred tax liability (asset) | (4,773) | (4,869)
NON- CAPITAL LOSS CARRY- FORWARDS |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Beginning balance, deferred tax liability (asset) | 60 | 63
Income statements | (23) | (4)
Business acquisitions | (1) | 1
Ending balance, deferred tax liability (asset) | 36 | 60
POST- EMPLOYMENT BENEFIT PLANS |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Beginning balance, deferred tax liability (asset) | (602) | (466)
Income statements | 10 | 15
Other comprehensive (loss)/income | 149 | (151)
Ending balance, deferred tax liability (asset) | (443) | (602)
INDEFINITE- LIFE INTANGIBLE ASSETS |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Beginning balance, deferred tax liability (asset) | (1,767) | (1,701)
Income statements | (35) | (40)
Business acquisitions | (10) | (26)
Increase (Decrease) Through Transfer To Held-For-Sale, Deferred Tax Liability (Asset) | 7 |
Ending balance, deferred tax liability (asset) | (1,805) | (1,767)
PROPERTY, PLANT AND EQUIPMENT AND FINITE- LIFE INTANGIBLE ASSETS |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Beginning balance, deferred tax liability (asset) | (2,745) | (2,417)
Income statements | (36) | (307)
Business acquisitions | (4) | (21)
Increase (Decrease) Through Transfer To Held-For-Sale, Deferred Tax Liability (Asset) | (1) |
Other | 5 |
Ending balance, deferred tax liability (asset) | (2,781) | (2,745)
OTHER |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Beginning balance, deferred tax liability (asset) | 185 | (53)
Income statements | (6) | 148
Business acquisitions | (3) | 3
Other comprehensive (loss)/income | 50 | 78
Deficit | (8) | (7)
Other | 2 | 16
Ending balance, deferred tax liability (asset) | $ 220 | $ 185

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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 2023-01-01 -Paragraph 81 -Subparagraph g -Clause ii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=12&code=ifrs-tx-2023-en-r&anchor=para_81_g_ii&doctype=Standard -URIDate 2023-03-23 + Details
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