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 |
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| 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 | |||
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