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Trade receivables - Components of trade receivables (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of provision matrix [line items]        
Gross trade receivables $ 1,429 $ 1,438    
Provision (68) (48) $ (54) $ (77)
Total trade receivables, net 1,361 1,390    
Not overdue [member]        
Disclosure of provision matrix [line items]        
Gross trade receivables 1,137 1,135    
Provision (2) (1)    
Total trade receivables, net $ 1,135 $ 1,134    
Expected credit loss rates 0.20% 0.10%    
Past due for not more than one month [member]        
Disclosure of provision matrix [line items]        
Gross trade receivables $ 109 $ 118    
Provision (1) (1)    
Total trade receivables, net $ 108 $ 117    
Expected credit loss rates 0.90% 0.80%    
Past due for more than one month but less than three months [member]        
Disclosure of provision matrix [line items]        
Gross trade receivables $ 67 $ 81    
Provision (2) (1)    
Total trade receivables, net $ 65 $ 80    
Expected credit loss rates 3.00% 1.20%    
Past due for more than three months but less than six months [member]        
Disclosure of provision matrix [line items]        
Gross trade receivables $ 36 $ 47    
Provision (2) (2)    
Total trade receivables, net $ 34 $ 45    
Expected credit loss rates 5.60% 4.30%    
Past due for more than six months but less than one year [member]        
Disclosure of provision matrix [line items]        
Gross trade receivables $ 31 $ 21    
Provision (18) (12)    
Total trade receivables, net $ 13 $ 9    
Expected credit loss rates 58.10% 57.10%    
Past due for more than one year [member]        
Disclosure of provision matrix [line items]        
Gross trade receivables $ 49 $ 36    
Provision (43) (31)    
Total trade receivables, net $ 6 $ 5    
Expected credit loss rates 87.80% 86.10%