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Other income (expense) - Schedule of Other (Expense) Income (Details) - CAD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2026 | Jun. 30, 2025 | Jun. 30, 2026 | Jun. 30, 2025
Analysis of income and expense [abstract] |  |  |  |  |
Net early debt redemption gains | [1] | $ 89 | $ 91 | $ 89 | $ 357
Interest income |  | 15 | 15 | 29 | 41
Equity gains (losses) from investments in associates and joint ventures |  |  |  |  |
Operations |  | 7 | (1) | 10 | (1)
Gains (losses) on change in fair value of derivatives |  | (62) | (43) | (29) | (42)
Losses on retirements and disposals of property, plant and equipment and intangible assets |  | (1) | (7) | (12) | (10)
Other |  | 10 | (85) | 9 | (65)
Total other income (expense) | [2] | $ 58 | $ (30) | $ 96 | $ 280
[1] | We have presented amounts from the previous period to make them consistent with the presentation for the current period.
[2] | We have presented amounts from the previous period to make them consistent with the presentation of the current period.

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- Definition The gains (losses) resulting from change in the fair value of derivatives recognised in profit or loss. [Refer: Derivatives [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Note Expiry date 2027-01-01 -Name IAS -Number 1 -IssueDate 2025-01-01 -Paragraph 85 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_85&doctype=Standard -URIDate 2025-03-27 + Details
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