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Income taxes - Deferred Taxes Resulting From Temporary Differences (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Beginning balance, deferred tax liability (asset) | $ (5,108) | $ (4,773)
Income statements | (142) | (95)
Business acquisitions | (218) | (94)
Other comprehensive (loss) income | (464) | (128)
Deficit | 1 | (26)
Net foreign exchange differences | 2 |
Reclassified to liabilities (assets) held for sale | 0 | 0
Other | 2 | 8
Ending balance, deferred tax liability (asset) | (5,927) | (5,108)
Non-capital loss carry-forwards |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Beginning balance, deferred tax liability (asset) | 73 | 36
Income statements | 84 | 31
Business acquisitions | 243 |
Net foreign exchange differences | (3) |
Other |  | 6
Ending balance, deferred tax liability (asset) | 397 | 73
Post-employment benefit plans |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Beginning balance, deferred tax liability (asset) | (634) | (443)
Income statements | 12 | 25
Business acquisitions | 20 | (3)
Other comprehensive (loss) income | (229) | (213)
Ending balance, deferred tax liability (asset) | (831) | (634)
Indefinite-life intangible assets |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Beginning balance, deferred tax liability (asset) | (1,662) | (1,805)
Income statements | 90 | 148
Business acquisitions | (37) | (5)
Other | (4) |
Ending balance, deferred tax liability (asset) | (1,613) | (1,662)
Property, plant and equipment and finite-life intangible assets |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Beginning balance, deferred tax liability (asset) | (4,393) | (4,069)
Income statements | (167) | (213)
Business acquisitions | (520) | (116)
Net foreign exchange differences | 5 |
Reclassified to liabilities (assets) held for sale | 2 | 3
Other | (3) | 2
Ending balance, deferred tax liability (asset) | (5,076) | (4,393)
Lease liabilities |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Beginning balance, deferred tax liability (asset) | 1,215 | 1,288
Income statements | 88 | 102
Business acquisitions | 12 | 32
Reclassified to liabilities (assets) held for sale | (2) | (3)
Ending balance, deferred tax liability (asset) | 1,137 | 1,215
Other |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Beginning balance, deferred tax liability (asset) | 293 | 220
Income statements | (73) | 16
Business acquisitions | 64 | (2)
Other comprehensive (loss) income | (235) | 85
Deficit | 1 | (26)
Other | 9 |
Ending balance, deferred tax liability (asset) | $ 59 | $ 293

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