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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, 2020
Dec. 31, 2019
Contract Assets [Line Items]    
Contract assets, net $ 31 $ 41 [1]
Contract liabilities [abstract]    
Short-term portion 90 82 [1]
Revenue that was included in contract liability balance at beginning of period 82 87
Transaction price allocated to remaining performance obligations 59  
Contract Costs, Net [Roll Forward]    
Contract costs, net, beginning of period 5 5
Contract costs capitalized 1 7
Amortisation, assets recognised from costs incurred to obtain or fulfil contracts with customers (1) (6)
Contract costs, net, end of period 5 4
Gross Carrying Amount, Non-current    
Contract Assets [Line Items]    
Contract assets, net 6 6
Gross Carrying Amount, Current    
Contract Assets [Line Items]    
Contract assets, net 28 37
Provisions    
Contract Assets [Line Items]    
Contract assets, net (2) (2)
Current contract liabilities    
Contract liabilities [abstract]    
Long-term portion 2 1
Short-term portion 89 81
Total 90 $ 82
2020    
Contract liabilities [abstract]    
Transaction price allocated to remaining performance obligations 59  
2021    
Contract liabilities [abstract]    
Transaction price allocated to remaining performance obligations $ 1  
[1] The consolidated statement of financial position at December 31, 2019 has been restated after finalization of the purchase accounting of our acquisitions in Nicaragua and Panama (note A.1.2.).