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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, 2020
Dec. 31, 2019
Dec. 31, 2018
Financial Assets      
Change in other financial receivables from former parent $ 0 $ 39 $ 26
Financial Liabilities      
Proceeds from non-current financial debts, net of issuance costs 744 3,724 0
Repayment of non-current financial debts 0 (509) 0
Proceeds from Bridge Facility, net of issuance costs 0 1,495 0
Repayment of Bridge Facility 0 (1,500) 0
Change in current financial debts (139) 202 (6)
Change in other financial liabilities to former parent 0 (67) 21
Lease liabilities      
Lease liabilities, beginning balance 341    
Payments of lease liabilities, net (69) (52) 0
Lease liabilities, ending balance 385 341  
Non-current financial debt [member]      
Financial Liabilities      
Financial liabilities, beginning balance 3,218 0  
Proceeds from non-current financial debts, net of issuance costs 744 3,724  
Repayment of non-current financial debts   (509)  
Change in current financial debts 0    
Amortization of discounts on financial debts 1    
Changes in fair values and other non-cash changes, net 4 2  
Currency translation effects 37 1  
Reclassification from non-current to current (55)    
Financial liabilities, ending balance 3,949 3,218 0
Current financial debt [member]      
Financial Liabilities      
Financial liabilities, beginning balance 261 47  
Proceeds from non-current financial debts, net of issuance costs 0    
Proceeds from Bridge Facility, net of issuance costs   1,495  
Repayment of Bridge Facility   (1,500)  
Change in current financial debts (139) 202  
Amortization of discounts on financial debts 0    
Changes in fair values and other non-cash changes, net (9) 20  
Currency translation effects 1 (3)  
Reclassification from non-current to current 55    
Financial liabilities, ending balance 169 261 47
Other financial liabilities to former parent [member]      
Financial Liabilities      
Financial liabilities, beginning balance 0 67  
Change in other financial liabilities to former parent   (67)  
Financial liabilities, ending balance   0 67
Non-current Lease liabilities [member]      
Lease liabilities      
Lease liabilities, beginning balance 280 89  
New leases 96    
Payments of lease liabilities, net 0 0  
Interest payments for amounts included in lease liabilities classified as cash flows from operating activities 0 0  
Changes in fair values and other non-cash changes, net (2) (2)  
Currency translation effects 10 1  
Reclassification from non-current to current (69) (56)  
Lease liabilities, ending balance 315 280 89
Non-current Lease liabilities [member] | Increase (decrease) due to changes in accounting policy required by IFRSs [member]      
Lease liabilities      
Lease liabilities, beginning balance   248  
Lease liabilities, ending balance     248
Current Lease liabilities [member]      
Lease liabilities      
Lease liabilities, beginning balance 61 0  
New leases 11    
Payments of lease liabilities, net (69) (52)  
Interest payments for amounts included in lease liabilities classified as cash flows from operating activities (12) (5)  
Changes in fair values and other non-cash changes, net 8 8  
Currency translation effects 2 0  
Reclassification from non-current to current 69 56  
Lease liabilities, ending balance 70 61 0
Current Lease liabilities [member] | Increase (decrease) due to changes in accounting policy required by IFRSs [member]      
Lease liabilities      
Lease liabilities, beginning balance   54  
Lease liabilities, ending balance     54
Other financial receivables from former parent [member]      
Financial Assets      
Financial assets, ending balance   0 $ (39)
Change in other financial receivables from former parent   39  
Financial assets, beginning balance $ 0 $ (39)