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Income taxes - Deferred Taxes Resulting From Temporary Differences (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Beginning balance, deferred tax liability (asset) $ (4,869) $ (4,574)
Income statements (90) (188)
Business acquisitions (18) (43)
Other comprehensive (loss)/income 199 (73)
Deficit (8) (7)
Increase (Decrease) Through Transfer To Held-For-Sale, Deferred Tax Liability (Asset) 6  
Other 7 16
Ending balance, deferred tax liability (asset) (4,773) (4,869)
NON- CAPITAL LOSS CARRY- FORWARDS    
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Beginning balance, deferred tax liability (asset) 60 63
Income statements (23) (4)
Business acquisitions (1) 1
Ending balance, deferred tax liability (asset) 36 60
POST- EMPLOYMENT BENEFIT PLANS    
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Beginning balance, deferred tax liability (asset) (602) (466)
Income statements 10 15
Other comprehensive (loss)/income 149 (151)
Ending balance, deferred tax liability (asset) (443) (602)
INDEFINITE- LIFE INTANGIBLE ASSETS    
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Beginning balance, deferred tax liability (asset) (1,767) (1,701)
Income statements (35) (40)
Business acquisitions (10) (26)
Increase (Decrease) Through Transfer To Held-For-Sale, Deferred Tax Liability (Asset) 7  
Ending balance, deferred tax liability (asset) (1,805) (1,767)
PROPERTY, PLANT AND EQUIPMENT AND FINITE- LIFE INTANGIBLE ASSETS    
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Beginning balance, deferred tax liability (asset) (2,745) (2,417)
Income statements (36) (307)
Business acquisitions (4) (21)
Increase (Decrease) Through Transfer To Held-For-Sale, Deferred Tax Liability (Asset) (1)  
Other 5  
Ending balance, deferred tax liability (asset) (2,781) (2,745)
OTHER    
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Beginning balance, deferred tax liability (asset) 185 (53)
Income statements (6) 148
Business acquisitions (3) 3
Other comprehensive (loss)/income 50 78
Deficit (8) (7)
Other 2 16
Ending balance, deferred tax liability (asset) $ 220 $ 185