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Contract costs (Details) - CAD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Revenue From Contract With Customer1 [Abstract]    
Opening balance $ 894 $ 764
Incremental costs of obtaining a contract and contract fulfillment costs 807 635
Amortization included in operating costs (558) (504)
Acquisitions 0 3
Reclassified to assets held for sale 0 (4)
Ending balance $ 1,143 $ 894
Bottom of range    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Contract costs, amortization period 12 months  
Top of range    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Contract costs, amortization period 84 months