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Contracts assets and liabilities (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
CONTRACT ASSETS      
Beginning balance $ 1,644 $ 1,493  
Revenue recognized from contract liabilities included in contract assets at the beginning of the year 188 131  
Increase in contract liabilities included in contract assets during the year (186) (175)  
Increase in contract assets from revenue recognized during the year 834 1,915  
Contract assets transferred to trade receivables (1,376) (1,461)  
Contract assets transferred to trade receivables (51) (47)  
Acquisitions 0 0  
Contract terminations transferred to trade receivables (145) (205)  
Discontinued operations (1) 0  
Other (15) (54)  
Ending balance 943 1,644  
CONTRACT LIABILITIES      
Opening balance 890 899  
Revenue recognized included in contract liabilities at the beginning of the year (643) (666)  
Increase in contract liabilities during the year 688 644  
Contract assets transferred to trade receivables 51 47  
Acquisitions 0 (4)  
Contract terminations transferred to trade receivables 19 24  
Discontinued operations 0 0  
Other (46) (54)  
Ending balance 959 890  
Contract assets      
CONTRACT LIABILITIES      
Allowance for doubtful accounts $ 59 $ 68 $ 73