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Other assets and liabilities F.5. Assets and liabilities related to contract with customers (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Jan. 01, 2018
Dec. 31, 2017
Contract Assets [Line Items]      
Contract assets, net $ 37 $ 28 $ 0
Contract liabilities [abstract]      
Short-term portion 87 $ 51 $ 0 [1]
Revenue that was included in contract liability balance at beginning of period 45    
Transaction price allocated to remaining performance obligations 42    
Contract costs, net, beginning of period 4    
Contract costs capitalized 4    
Amortisation, assets recognised from costs incurred to obtain or fulfil contracts with customers (4)    
Contract costs, net, end of period 4    
Gross Carrying Amount, Non-current      
Contract Assets [Line Items]      
Contract assets, net 3    
Gross Carrying Amount, Current      
Contract Assets [Line Items]      
Contract assets, net 35    
Provisions      
Contract Assets [Line Items]      
Contract assets, net (1)    
Current contract liabilities      
Contract liabilities [abstract]      
Long-term portion 1    
Short-term portion 86    
Total 87    
2021      
Contract liabilities [abstract]      
Transaction price allocated to remaining performance obligations 41    
2020      
Contract liabilities [abstract]      
Transaction price allocated to remaining performance obligations $ 1    
[1] Not restated for the application of IFRS 15 and 9, as the Group elected the modified retrospective approach for both standards.