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INCOME TAXES - Deferred income taxes (Details) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Movement of net deferred tax assets and liabilities |  |
Deferred tax assets (liabilities), beginning of period | $ (6,379) | $ (3,652)
Recovery (expense) in net income | 292 | (190)
Expense in other comprehensive income | (194) | 167
Acquisitions |  | (2,704)
Deferred tax assets (liabilities), end of period | (6,281) | (6,379)
Property, plant and equipment and inventory |  |
Movement of net deferred tax assets and liabilities |  |
Deferred tax assets (liabilities), beginning of period | (3,509) | (2,149)
Recovery (expense) in net income | 284 | (95)
Expense in other comprehensive income | 0 | 0
Acquisitions |  | (1,265)
Deferred tax assets (liabilities), end of period | (3,225) | (3,509)
Goodwill and other intangibles |  |
Movement of net deferred tax assets and liabilities |  |
Deferred tax assets (liabilities), beginning of period | (3,316) | (1,754)
Recovery (expense) in net income | (29) | (89)
Expense in other comprehensive income | 0 | 0
Acquisitions |  | (1,473)
Deferred tax assets (liabilities), end of period | (3,345) | (3,316)
Investments |  |
Movement of net deferred tax assets and liabilities |  |
Deferred tax assets (liabilities), beginning of period | (2) | (89)
Recovery (expense) in net income | 1 | 35
Expense in other comprehensive income | (1) | 52
Acquisitions |  | 0
Deferred tax assets (liabilities), end of period | (2) | (2)
Lease liabilities |  |
Movement of net deferred tax assets and liabilities |  |
Deferred tax assets (liabilities), beginning of period | 554 | 458
Recovery (expense) in net income | 17 | 14
Expense in other comprehensive income | 0 | 0
Acquisitions |  | 82
Deferred tax assets (liabilities), end of period | 571 | 554
Contract and deferred commission cost assets |  |
Movement of net deferred tax assets and liabilities |  |
Deferred tax assets (liabilities), beginning of period | (123) | (87)
Recovery (expense) in net income | (56) | (36)
Expense in other comprehensive income | 0 | 0
Acquisitions |  | 0
Deferred tax assets (liabilities), end of period | (179) | (123)
Other |  |
Movement of net deferred tax assets and liabilities |  |
Deferred tax assets (liabilities), beginning of period | 17 | (31)
Recovery (expense) in net income | 75 | (19)
Expense in other comprehensive income | (193) | 115
Acquisitions |  | (48)
Deferred tax assets (liabilities), end of period | $ (101) | $ 17

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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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