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Income taxes - Deferred Taxes Resulting From Temporary Differences (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Deferred tax liability (asset) $ (4,574) $ (3,704)
Income statement (188) (226)
Business acquisitions (43) (4)
Other comprehensive income (73) (677)
Deficit (7) 30
Reclassified to liabilities held for sale   5
Other 16 2
Deferred tax liability (asset) (4,869) (4,574)
NON- CAPITAL LOSS CARRY- FORWARDS    
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Deferred tax liability (asset) 63 69
Income statement (4) (10)
Business acquisitions 1 4
Deferred tax liability (asset) 60 63
POST- EMPLOYMENT BENEFIT PLANS    
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Deferred tax liability (asset) (466) 185
Income statement 15 2
Other comprehensive income (151) (653)
Deferred tax liability (asset) (602) (466)
INDEFINITE- LIFE INTANGIBLE ASSETS    
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Deferred tax liability (asset) (1,701) (1,717)
Income statement (40) 16
Business acquisitions (26)  
Deferred tax liability (asset) (1,767) (1,701)
PROPERTY, PLANT AND EQUIPMENT AND FINITE- LIFE INTANGIBLE ASSETS    
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Deferred tax liability (asset) (2,417) (2,175)
Income statement (307) (253)
Business acquisitions (21) (9)
Deficit   16
Reclassified to liabilities held for sale   4
Deferred tax liability (asset) (2,745) (2,417)
OTHER    
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Deferred tax liability (asset) (53) (66)
Income statement 148 19
Business acquisitions 3 1
Other comprehensive income 78 (24)
Deficit (7) 14
Reclassified to liabilities held for sale   1
Other 16 2
Deferred tax liability (asset) $ 185 $ (53)