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income taxes - Temporary differences (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Reconciliation of temporary differences |  |
Balance at beginning of period | $ 4,352 | $ 4,436
Deferred income tax expense recognized in Net income | (167) | (140)
Deferred income tax expense recognized in other comprehensive income | (45) | (40)
Deferred income taxes charged directly to owners' equity and other | 73 | 96
Balance at end of period | 4,213 | 4,352
Property, plant, and equipment (owned) and intangible assets subject to amortization |  |
Reconciliation of temporary differences |  |
Balance at beginning of period | 2,730 | 2,846
Deferred income tax expense recognized in Net income | (88) | (237)
Deferred income taxes charged directly to owners' equity and other | 51 | 121
Balance at end of period | 2,693 | 2,730
Intangible assets with indefinite lives |  |
Reconciliation of temporary differences |  |
Balance at beginning of period | 1,945 | 1,856
Deferred income tax expense recognized in Net income | 80 | 89
Balance at end of period | 2,025 | 1,945
Property plant and equipment (leased), net of lease liabilities |  |
Reconciliation of temporary differences |  |
Balance at beginning of period | 43 | (32)
Deferred income tax expense recognized in Net income | (38) | 75
Balance at end of period | 5 | 43
Contract assets and liabilities |  |
Reconciliation of temporary differences |  |
Balance at beginning of period | 126 | 105
Deferred income tax expense recognized in Net income | 42 | 21
Balance at end of period | 168 | 126
Net pension amounts |  |
Reconciliation of temporary differences |  |
Balance at beginning of period | (50) | (34)
Deferred income tax expense recognized in Net income | (13) | (16)
Deferred income tax expense recognized in other comprehensive income | 2 |
Balance at end of period | (61) | (50)
Provisions not currently deductible |  |
Reconciliation of temporary differences |  |
Balance at beginning of period | (204) | (150)
Deferred income tax expense recognized in Net income | (5) | (52)
Deferred income taxes charged directly to owners' equity and other | (3) | (2)
Balance at end of period | (212) | (204)
Losses available to be carried forward |  |
Reconciliation of temporary differences |  |
Balance at beginning of period | (202) | (144)
Deferred income tax expense recognized in Net income | (36) | (37)
Deferred income taxes charged directly to owners' equity and other | (7) | (21)
Balance at end of period | (245) | (202)
Share-based compensation amounts and other |  |
Reconciliation of temporary differences |  |
Balance at beginning of period | (36) | (11)
Deferred income tax expense recognized in Net income | (109) | 17
Deferred income tax expense recognized in other comprehensive income | (47) | (40)
Deferred income taxes charged directly to owners' equity and other | 32 | (2)
Balance at end of period | $ (160) | $ (36)

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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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