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income taxes - Temporary differences (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Reconciliation of temporary differences      
Balance at beginning of period $ 3,208 $ 3,090  
Deferred income tax expense recognized in Net income 76 115  
Deferred income tax expense recognized in Other comprehensive income (122) (78)  
Deferred income taxes charged directly to owners' equity and other 603 81  
Balance at end of period 3,765 3,208  
Deferred tax assets and liabilities      
Deferred tax liabilities 3,776 3,214 $ 3,095
Deferred tax assets 11 6 $ 5
Property, plant, and equipment owned and intangible assets subject to amortization      
Reconciliation of temporary differences      
Balance at beginning of period 1,616 1,204  
Deferred income tax expense recognized in Net income 85 332  
Deferred income taxes charged directly to owners' equity and other 621 80  
Balance at end of period 2,322 1,616  
Intangible assets with indefinite lives      
Reconciliation of temporary differences      
Balance at beginning of period 1,608 1,718  
Deferred income tax expense recognized in Net income 82 (110)  
Deferred income taxes charged directly to owners' equity and other 2    
Balance at end of period 1,692 1,608  
Property plant and equipment (leased), net of lease liabilities      
Reconciliation of temporary differences      
Balance at beginning of period (77) (83)  
Deferred income tax expense recognized in Net income 37 6  
Balance at end of period (40) (77)  
Contract assets and liabilities      
Reconciliation of temporary differences      
Balance at beginning of period 418 496  
Deferred income tax expense recognized in Net income (111) (78)  
Balance at end of period 307 418  
Net pension and share-based compensation amounts      
Reconciliation of temporary differences      
Balance at beginning of period (140) (21)  
Deferred income tax expense recognized in Net income (31) (9)  
Deferred income tax expense recognized in Other comprehensive income (109) (110)  
Balance at end of period (280) (140)  
Provisions not currently deductible      
Reconciliation of temporary differences      
Balance at beginning of period (212) (189)  
Deferred income tax expense recognized in Net income 8 (23)  
Balance at end of period (204) (212)  
Losses available to be carried forward      
Reconciliation of temporary differences      
Balance at beginning of period (11) (6)  
Deferred income tax expense recognized in Net income (33) (5)  
Deferred income taxes charged directly to owners' equity and other (4)    
Balance at end of period (48) (11)  
Other      
Reconciliation of temporary differences      
Balance at beginning of period 6 (29)  
Deferred income tax expense recognized in Net income 39 2  
Deferred income tax expense recognized in Other comprehensive income (13) 32  
Deferred income taxes charged directly to owners' equity and other (16) 1  
Balance at end of period $ 16 $ 6