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Trade receivables - Trade receivables by currency (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Disclosure of geographical areas [line items]    
Total trade receivables, net $ 1,390 $ 1,253
US dollar (USD)    
Disclosure of geographical areas [line items]    
Total trade receivables, net 463 449
Euro (EUR)    
Disclosure of geographical areas [line items]    
Total trade receivables, net 243 215
Japanese yen (JPY)    
Disclosure of geographical areas [line items]    
Total trade receivables, net 168 152
Chinese yuan (CNY)    
Disclosure of geographical areas [line items]    
Total trade receivables, net 102 74
Indian rupee (INR)    
Disclosure of geographical areas [line items]    
Total trade receivables, net 33 34
Canadian dollar (CAD)    
Disclosure of geographical areas [line items]    
Total trade receivables, net 30 30
Australian dollar (AUD)    
Disclosure of geographical areas [line items]    
Total trade receivables, net 29 27
British pound (GBP)    
Disclosure of geographical areas [line items]    
Total trade receivables, net 24 25
Russian ruble (RUB)    
Disclosure of geographical areas [line items]    
Total trade receivables, net 34 24
South Korean won (KRW)    
Disclosure of geographical areas [line items]    
Total trade receivables, net 29 23
Other currencies    
Disclosure of geographical areas [line items]    
Total trade receivables, net $ 235 $ 200