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Contract costs (Tables)
12 Months Ended
Dec. 31, 2023
Subclassifications of assets, liabilities and equities [abstract]  
Reconciliation of Contract Costs
The table below provides a reconciliation of the contract costs balance.
FOR THE YEAR ENDED DECEMBER 31 2023 2022
Opening balance, January 1 1,143  894 
Incremental costs of obtaining a contract and contract fulfillment costs 892  807 
Amortization included in operating costs (623) (558)
Ending balance, December 31 1,412  1,143