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Intangible assets and goodwill - Schedule of Intangible assets and goodwill (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Intangible assets and goodwill      
Balance at beginning of the year $ 2,358    
Amortization (183) $ (134) $ (142)
Balance at end of the year 3,509 2,358  
At cost      
Intangible assets and goodwill      
Balance at beginning of the year 2,713 2,776  
Additions 14 12  
Additions from acquisition 1,293 9  
Dispositions and other (34) (11)  
Foreign exchange (33) 73  
Balance at end of the year 4,019 2,713 2,776
Accumulated amortization      
Intangible assets and goodwill      
Balance at beginning of the year (355) (238)  
Amortization 183 134  
Dispositions and other 34 11  
Foreign exchange 6 (6)  
Balance at end of the year (510) (355) (238)
Total intangible assets      
Intangible assets and goodwill      
Balance at beginning of the year 1,008    
Balance at end of the year 1,546 1,008  
Total intangible assets | At cost      
Intangible assets and goodwill      
Balance at beginning of the year 1,363 1,396  
Additions 14 12  
Additions from acquisition 694 0  
Dispositions and other (34) (11)  
Foreign exchange (19) 34  
Balance at end of the year 2,056 1,363 1,396
Total intangible assets | Accumulated amortization      
Intangible assets and goodwill      
Balance at beginning of the year (355) (238)  
Amortization 183 134  
Dispositions and other 34 11  
Foreign exchange 6 (6)  
Balance at end of the year (510) (355) (238)
Customer relationships      
Intangible assets and goodwill      
Balance at beginning of the year 887    
Balance at end of the year 1,362 887  
Customer relationships | At cost      
Intangible assets and goodwill      
Balance at beginning of the year 1,151 1,182  
Additions 0 0  
Additions from acquisition 602 0  
Dispositions and other 0 0  
Foreign exchange (16) 31  
Balance at end of the year 1,769 1,151 1,182
Customer relationships | Accumulated amortization      
Intangible assets and goodwill      
Balance at beginning of the year (264) (173)  
Amortization 138 96  
Dispositions and other 0 0  
Foreign exchange 5 (5)  
Balance at end of the year (407) (264) (173)
Crowdsource assets      
Intangible assets and goodwill      
Balance at beginning of the year 90    
Balance at end of the year 75 90  
Crowdsource assets | At cost      
Intangible assets and goodwill      
Balance at beginning of the year 120 120  
Additions 0 0  
Additions from acquisition 0 0  
Dispositions and other 0 0  
Foreign exchange 0 0  
Balance at end of the year 120 120 120
Crowdsource assets | Accumulated amortization      
Intangible assets and goodwill      
Balance at beginning of the year (30) (15)  
Amortization 15 15  
Dispositions and other 0 0  
Foreign exchange 0 0  
Balance at end of the year (45) (30) (15)
Software      
Intangible assets and goodwill      
Balance at beginning of the year 24    
Balance at end of the year 30 24  
Software | At cost      
Intangible assets and goodwill      
Balance at beginning of the year 57 57  
Additions 14 12  
Additions from acquisition 0 0  
Dispositions and other (9) (11)  
Foreign exchange (1) 1  
Balance at end of the year 63 57 57
Software | Accumulated amortization      
Intangible assets and goodwill      
Balance at beginning of the year (33) (31)  
Amortization 9 13  
Dispositions and other 9 11  
Foreign exchange 0 0  
Balance at end of the year (33) (33) (31)
Brand      
Intangible assets and goodwill      
Balance at beginning of the year 7    
Balance at end of the year 79 7  
Brand | At cost      
Intangible assets and goodwill      
Balance at beginning of the year 35 37  
Additions 0 0  
Additions from acquisition 92 0  
Dispositions and other (25) 0  
Foreign exchange (2) 2  
Balance at end of the year 104 35 37
Brand | Accumulated amortization      
Intangible assets and goodwill      
Balance at beginning of the year (28) (19)  
Amortization 21 10  
Dispositions and other 25 0  
Foreign exchange 1 (1)  
Balance at end of the year (25) (28) (19)
Goodwill      
Intangible assets and goodwill      
Balance at beginning of the year 1,350    
Balance at end of the year 1,963 1,350  
Goodwill | At cost      
Intangible assets and goodwill      
Balance at beginning of the year 1,350 1,380  
Additions 0 0  
Additions from acquisition 599 9  
Dispositions and other 0 0  
Foreign exchange (14) 39  
Balance at end of the year 1,963 1,350 1,380
Goodwill | Accumulated amortization      
Intangible assets and goodwill      
Balance at beginning of the year 0 0  
Amortization 0 0  
Dispositions and other 0 0  
Foreign exchange 0 0  
Balance at end of the year $ 0 $ 0 $ 0