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Contract costs (Tables)
12 Months Ended
Dec. 31, 2022
Revenue From Contract With Customer1 [Abstract]  
Contract costs
The table below provides a reconciliation of the contract costs balance.
FOR THE YEAR ENDED DECEMBER 31 NOTE 2022 2021
Opening balance, January 1 894  764 
Incremental costs of obtaining a contract and contract fulfillment costs 807  635 
Amortization included in operating costs (558) (504)
Acquisitions  
Reclassified to assets held for sale 16   (4)
Ending balance, December 31 1,143  894