v3.25.4
Contract costs (Tables)
12 Months Ended
Dec. 31, 2025
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 Note 2025 2024
Opening balance, January 1 1,590  1,412 
Incremental costs of obtaining a contract and contract fulfillment costs 1,035  969 
Amortization included in operating costs (811) (791)
Dispositions 17 (6) — 
Ending balance, December 31 1,808  1,590