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Consolidated statement of cash flows - additional details - Reconciliation of assets and liabilities arising from financing activities (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Proceeds from non-current financial debts, net of issuance costs $ 3,724 $ 0 $ 0
Repayment of non-current financial debts (509) 0 0
Proceeds from Bridge Facility, net of issuance costs 1,495 0 0
Repayment of Bridge Facility (1,500) 0 0
Change in current financial debts 202 (6) (111)
Change in other financial receivables from former parent 39 26 (24)
Change in other financial liabilities to former parent (67) 21 20
Non-current financial debt [member]      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Financial liabilities, beginning balance 0 84  
Proceeds from non-current financial debts, net of issuance costs 3,724    
Repayment of non-current financial debts (509)    
Non-cash changes in derivatives and other fair value adjustments 2    
Non-cash change in finance lease obligation   5  
Currency translation effects 1    
Reclassification from non-current financial debts to lease liabilities   (89)  
Financial liabilities, ending balance 3,218 0 84
Current financial debt [member]      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Financial liabilities, beginning balance 47 65  
Proceeds from Bridge Facility, net of issuance costs 1,495    
Repayment of Bridge Facility (1,500)    
Change in current financial debts 202 (6)  
Non-cash changes in derivatives and other fair value adjustments 20    
Currency translation effects (3) (12)  
Financial liabilities, ending balance 261 47 65
Other financial liabilities to former parent [member]      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Financial liabilities, beginning balance 67 46  
Change in other financial liabilities to former parent (67) 21  
Financial liabilities, ending balance 0 67 46
Total liabilities arising from financing activities [member]      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Total, beginning balance 114 195  
Proceeds from non-current financial debts, net of issuance costs 3,724    
Repayment of non-current financial debts (509)    
Proceeds from Bridge Facility, net of issuance costs 1,495    
Repayment of Bridge Facility (1,500)    
Change in current financial debts 202 (6)  
Non-cash changes in derivatives and other fair value adjustments 22    
Change in other financial receivables from former parent    
Change in other financial liabilities to former parent (67) 21  
Non-cash change in finance lease obligation   5  
Currency translation effects (2) (12)  
Reclassification from non-current financial debts to lease liabilities   (89)  
Total, ending balance 3,479 114 195
Other financial receivables from former parent [member]      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Financial assets, beginning balance (39) (65)  
Change in other financial receivables from former parent 39 26  
Financial assets, ending balance $ 0 $ (39) $ (65)