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Contract assets and liabilities (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Contract assets      
Beginning balance $ 735 $ 724  
Revenue recognized from contract liabilities included in contract assets at the beginning of the year 102 84  
Increase in contract liabilities included in contract assets during the year (108) (88)  
Increase in contract assets from revenue recognized during the year 789 713  
Contract assets transferred to trade receivables (635) (613)  
Acquisitions 1    
Contract terminations transferred to trade receivables (62) (60)  
Other (63) (25)  
Ending balance 759 735  
Contract liabilities      
Opening balance 1,088 1,085  
Revenue recognized included in contract liabilities at the beginning of the year (834) (812)  
Increase in contract liabilities during the year 895 863  
Contract assets transferred to trade receivables 20 8  
Acquisitions 13    
Contract terminations transferred to trade receivables 2 (1)  
Other (60) (55)  
Ending balance 1,124 1,088  
Contract assets | Allowance for doubtful accounts      
Contract liabilities      
Financial assets $ 18 $ 18 $ 19