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Segment reporting (Tables)
 12 Months Ended
Dec. 31, 2024
Disclosure of operating segments [abstract]  
Schedule of reconciliation of revenue and net long-lived assets by geographic area
We attribute revenues from external customers to individual countries based on the location of our delivery centres or where the services were provided from.
Years Ended December 31 (millions)202420232022
United States$455 $520 $401 
Philippines437 466 448 
Canada280 268 217 
Guatemala285 261 224 
Germany201 221 275 
El Salvador178 169 140 
Spain132 149 127 
Bulgaria124 127 129 
India131 120 99 
Other435 407 408 
$2,658 $2,708 $2,468