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Income taxes - Deferred Taxes Resulting From Temporary Differences (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Deferred tax liability (asset) $ (3,463)  
Income statement (114) $ (396)
Business acquisitions 26 (2)
Other comprehensive income (172) (90)
Deficit (20) 13
Discontinued operations 30 (4)
Other 9 60
Deferred tax liability (asset) (3,704) (3,463)
Increase (decrease) through other, deferred tax liability (asset) (9) (60)
Increase (decrease) through business combinations, deferred tax liability (asset) (26) 2
NON- CAPITAL LOSS CARRY- FORWARDS    
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Deferred tax liability (asset) 31  
Income statement 13 (105)
Business acquisitions 25 5
Other 0 2
Deferred tax liability (asset) 69 31
Increase (decrease) through other, deferred tax liability (asset) 0 (2)
Increase (decrease) through business combinations, deferred tax liability (asset) (25) (5)
POST- EMPLOYMENT BENEFIT PLANS    
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Deferred tax liability (asset) 364  
Income statement 5 3
Other comprehensive income (184) (54)
Deferred tax liability (asset) 185 364
INDEFINITE- LIFE INTANGIBLE ASSETS    
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Deferred tax liability (asset) (1,763)  
Income statement 46 0
Deferred tax liability (asset) (1,717) (1,763)
PROPERTY, PLANT AND EQUIPMENT AND FINITE- LIFE INTANGIBLE ASSETS    
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Deferred tax liability (asset) (1,779)  
Income statement (426) (173)
Business acquisitions 0 (6)
Discontinued operations 30 (4)
Other 0 46
Deferred tax liability (asset) (2,175) (1,779)
Increase (decrease) through other, deferred tax liability (asset) 0 (46)
Increase (decrease) through business combinations, deferred tax liability (asset) 0 6
CRTC TANGIBLE BENEFITS    
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Deferred tax liability (asset) 7  
Income statement (7) (9)
Business acquisitions   0
Deferred tax liability (asset) 0 7
Increase (decrease) through business combinations, deferred tax liability (asset)   0
OTHER    
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Deferred tax liability (asset) (323)  
Income statement 255 (112)
Business acquisitions 1 (1)
Other comprehensive income 12 (36)
Deficit (20) 13
Other 9 12
Deferred tax liability (asset) (66) (323)
Increase (decrease) through other, deferred tax liability (asset) (9) (12)
Increase (decrease) through business combinations, deferred tax liability (asset) $ (1) $ 1