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Income taxes - Deferred Taxes Resulting From Temporary Differences (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Beginning balance, deferred tax liability (asset) $ (4,773) $ (4,869)
Income statements (95) (90)
Business acquisitions/business dispositions (94) (18)
Other comprehensive income (128) 199
Deficit (26) (8)
Reclassified to liabilities held for sale   6
Other 8 7
Ending balance, deferred tax liability (asset) (5,108) (4,773)
Non-capital loss carry-forwards    
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Beginning balance, deferred tax liability (asset) 36 60
Income statements 31 (23)
Business acquisitions/business dispositions   (1)
Ending balance, deferred tax liability (asset) 73 36
Post-employment benefit plans    
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Beginning balance, deferred tax liability (asset) (443) (602)
Income statements 25 10
Business acquisitions/business dispositions (3)  
Other comprehensive income (213) 149
Ending balance, deferred tax liability (asset) (634) (443)
Indefinite-life intangible assets    
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Beginning balance, deferred tax liability (asset) (1,805) (1,767)
Income statements 148 (35)
Business acquisitions/business dispositions (5) (10)
Reclassified to liabilities held for sale   7
Ending balance, deferred tax liability (asset) (1,662) (1,805)
Property, plant and equipment and finite-life intangible assets    
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Beginning balance, deferred tax liability (asset) (2,781) (2,745)
Income statements (315) (36)
Business acquisitions/business dispositions (84) (4)
Reclassified to liabilities held for sale   (1)
Other 2 5
Ending balance, deferred tax liability (asset) (3,178) (2,781)
Other    
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Beginning balance, deferred tax liability (asset) 220 185
Income statements 16 (6)
Business acquisitions/business dispositions (2) (3)
Other comprehensive income 85 50
Deficit (26) (8)
Other   2
Ending balance, deferred tax liability (asset) $ 293 $ 220