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Goodwill and intangible assets - Composition of Goodwill and Intangible Assets (Details) - USD ($)
$ in Millions
 9 Months Ended 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Dec. 31, 2021
Indefinite-lived Intangible Assets [Line Items]        
Goodwill $ 159   $ 153 $ 148
Total intangible assets 62   61  
Accumulated amortization (41)   (36)  
Total intangible assets, net 21   25  
Impairment of digital assets 0 $ 11    
Licenses and Others        
Indefinite-lived Intangible Assets [Line Items]        
Amortizable intangible assets 14   13  
Non-Compete Agreement        
Indefinite-lived Intangible Assets [Line Items]        
Amortizable intangible assets 4   4  
Customer Lists        
Indefinite-lived Intangible Assets [Line Items]        
Amortizable intangible assets 12   12  
Trademarks        
Indefinite-lived Intangible Assets [Line Items]        
Amortizable intangible assets 13   12  
Hub Network        
Indefinite-lived Intangible Assets [Line Items]        
Amortizable intangible assets 4   4  
Other Intangible Assets        
Indefinite-lived Intangible Assets [Line Items]        
Amortizable intangible assets 3   3  
Trademarks        
Indefinite-lived Intangible Assets [Line Items]        
Intangible assets with indefinite lives 3   4  
Digital Assets        
Indefinite-lived Intangible Assets [Line Items]        
Intangible assets with indefinite lives 9   9  
Impairment of digital assets $ 21   $ 21