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Goodwill and intangible assets - Changes in Carrying Amount of Goodwill (Details) - USD ($)
$ in Millions
 9 Months Ended 12 Months Ended
Sep. 30, 2023
Dec. 31, 2022
Goodwill [Roll Forward]    
Balance, beginning of the period $ 153 $ 148
Effect of exchange rates changes 6 5
Balance, end of the period 159 153
Brazil    
Goodwill [Roll Forward]    
Balance, beginning of the period 60 56
Effect of exchange rates changes 2 4
Balance, end of the period 62 60
Argentina    
Goodwill [Roll Forward]    
Balance, beginning of the period 10 10
Effect of exchange rates changes 0 0
Balance, end of the period 10 10
Mexico    
Goodwill [Roll Forward]    
Balance, beginning of the period 39 37
Effect of exchange rates changes 5 2
Balance, end of the period 44 39
Chile    
Goodwill [Roll Forward]    
Balance, beginning of the period 37 37
Effect of exchange rates changes (2) 0
Balance, end of the period 35 37
Colombia    
Goodwill [Roll Forward]    
Balance, beginning of the period 5 6
Effect of exchange rates changes 1 (1)
Balance, end of the period 6 5
Other countries    
Goodwill [Roll Forward]    
Balance, beginning of the period 2 2
Effect of exchange rates changes 0 0
Balance, end of the period $ 2 $ 2