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restructuring and other costs (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
restructuring and other costs    
Goods and services purchased $ 209 $ 65
Employee benefits expense 50 69
Total 259 134
Restructuring    
restructuring and other costs    
Goods and services purchased 160 56
Employee benefits expense 49 63
Total 209 119
Other    
restructuring and other costs    
Goods and services purchased 49 9
Employee benefits expense 1 6
Total $ 50 $ 15