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Trade receivables - Trade receivables from closely monitored countries (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Trade Receivables [Line Items]        
Gross trade receivables $ 1,730 $ 1,551    
Provisions for doubtful trade receivables (57) (55) $ (68) $ (48)
Greece, Italy, Portugal, Spain, Brazil, Russia, Turkey, Saudi Arabia, and Argentina        
Trade Receivables [Line Items]        
Gross trade receivables 280 252    
Provisions for doubtful trade receivables (10) (11)    
Past due for more than one year        
Trade Receivables [Line Items]        
Gross trade receivables 38 42    
Provisions for doubtful trade receivables (32) (36)    
Past due for more than one year | Greece, Italy, Portugal, Spain, Brazil, Russia, Turkey, Saudi Arabia, and Argentina        
Trade Receivables [Line Items]        
Gross trade receivables $ 8 $ 10