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Contracts assets and liabilities (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
CONTRACT ASSETS      
Beginning balance $ 665 $ 943  
Revenue recognized from contract liabilities included in contract assets at the beginning of the year 89 141  
Increase in contract liabilities included in contract assets during the year (83) (115)  
Increase in contract assets from revenue recognized during the year 728 664  
Contract assets transferred to trade receivables (586) (859)  
Acquisitions 0 0  
Contract terminations transferred to trade receivables (50) (89)  
Other (39) (20)  
Ending balance 724 665  
CONTRACT LIABILITIES      
Opening balance 1,045 959  
Revenue recognized included in contract liabilities at the beginning of the year (736) (678)  
Increase in contract liabilities during the year 794 752  
Contract assets transferred to trade receivables 14 50  
Acquisitions 8 13  
Contract terminations transferred to trade receivables (1) 4  
Reclassified to liabilities held for sale 0 (7)  
Other (39) (48)  
Ending balance 1,085 1,045  
Contract assets      
CONTRACT LIABILITIES      
Allowance for doubtful accounts $ 19 $ 20 $ 59