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provisions (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2020
provisions reconciliation      
Balance at beginning of period $ 878 $ 800  
Additions 397 184  
Reversals (140) (23)  
Uses (327) (224)  
Interest effects 176 160  
Effects of foreign exchange, net 13 (19)  
Balance at end of period 997 878  
Current     $ 73
Non-current     924
Total 997 878 997
Differences of interest effect due to change in discount rates as compared to interest accretion on provisions 160 138  
Asset retirement obligation      
provisions reconciliation      
Balance at beginning of period 495 336  
Additions   15  
Reversals (5)    
Uses (3) (5)  
Interest effects 174 149  
Balance at end of period 661 495  
Current     8
Non-current     653
Total 661 495 661
Employee-related      
provisions reconciliation      
Balance at beginning of period 64 88  
Additions 48 64  
Reversals (1)    
Uses (69) (88)  
Balance at end of period 42 64  
Current     36
Non-current     6
Total 42 64 42
Written put options and contingent consideration      
provisions reconciliation      
Balance at beginning of period 227 282  
Additions 149 32  
Reversals (114) (17)  
Uses (112) (62)  
Interest effects 2 11  
Effects of foreign exchange, net 13 (19)  
Balance at end of period 165 227  
Non-current     165
Total 165 227 165
Other      
provisions reconciliation      
Balance at beginning of period 92 94  
Additions 200 73  
Reversals (20) (6)  
Uses (143) (69)  
Balance at end of period 129 92  
Current     29
Non-current     100
Total $ 129 $ 92 $ 129