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Contracts assets and liabilities (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Contract assets      
Beginning balance $ 724 $ 665  
Revenue recognized from contract liabilities included in contract assets at the beginning of the year 84 89  
Increase in contract liabilities included in contract assets during the year (88) (83)  
Increase in contract assets from revenue recognized during the year 713 728  
Contract assets transferred to trade receivables (613) (586)  
Contract terminations transferred to trade receivables (60) (50)  
Other (25) (39)  
Ending balance 735 724  
Contract liabilities      
Opening balance 1,085 1,045  
Revenue recognized included in contract liabilities at the beginning of the year (734) (736)  
Increase in contract liabilities during the year 785 794  
Contract assets transferred to trade receivables 8 14  
Acquisitions / (Disposition) 0 8  
Contract terminations transferred to trade receivables (1) (1)  
Other (55) (39)  
Ending balance 1,088 1,085  
Contract assets      
Contract liabilities      
Allowance for doubtful accounts $ 18 $ 19 $ 20