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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, 2019
Dec. 31, 2018
Jan. 01, 2018
Dec. 31, 2017
Contract Assets [Line Items]        
Contract assets, net $ 41 $ 37 [1],[2] $ 28 $ 0
Contract liabilities [abstract]        
Short-term portion 82 87 [1],[2] $ 51 $ 0
Revenue that was included in contract liability balance at beginning of period 87 45    
Transaction price allocated to remaining performance obligations 61      
Contract Costs, Net [Roll Forward]        
Contract costs, net, beginning of period 5 4    
Contract costs capitalized 7 4    
Amortisation, assets recognised from costs incurred to obtain or fulfil contracts with customers (6) (4)    
Contract costs, net, end of period 4 4    
Gross Carrying Amount, Non-current        
Contract Assets [Line Items]        
Contract assets, net 6 3    
Gross Carrying Amount, Current        
Contract Assets [Line Items]        
Contract assets, net 37 35    
Provisions        
Contract Assets [Line Items]        
Contract assets, net (2) (1)    
Current contract liabilities        
Contract liabilities [abstract]        
Long-term portion 1 1    
Short-term portion 81 86    
Total 82 $ 87    
2020        
Contract liabilities [abstract]        
Transaction price allocated to remaining performance obligations 60      
2021        
Contract liabilities [abstract]        
Transaction price allocated to remaining performance obligations $ 1      
[1] Not restated for the application of IFRS 16 as the Group elected the modified retrospective approach.
[2] The consolidated statement of financial position at December 31, 2018 has been restated after finalization of the Cable Onda purchase accounting (note A.1.2.).