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Trade receivables - Trade receivables from closely monitored countries (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of geographical areas [line items]        
Total gross trade receivables $ 1,438 $ 1,307    
Provisions for doubtful trade receivables (48) (54) $ (77) $ (55)
Russia, Brazil, And Turkey [member]        
Disclosure of geographical areas [line items]        
Provisions for doubtful trade receivables (13) (16)    
Not overdue [member]        
Disclosure of geographical areas [line items]        
Total gross trade receivables 1,135 1,018    
Not overdue [member] | Russia, Brazil, And Turkey [member]        
Disclosure of geographical areas [line items]        
Total gross trade receivables 209 216    
Past due for more than one year [member]        
Disclosure of geographical areas [line items]        
Total gross trade receivables 36 47    
Past due for more than one year [member] | Russia, Brazil, And Turkey [member]        
Disclosure of geographical areas [line items]        
Total gross trade receivables $ 10 $ 14