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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, 2021
Dec. 31, 2020
Contract Assets [Line Items]    
Contract assets, net $ 69 [1] $ 31
Contract liabilities [abstract]    
Short-term portion 97 [1] 90
Revenue that was included in contract liability balance at beginning of period 86 82
Transaction price allocated to remaining performance obligations 101  
Contract Costs, Net [Roll Forward]    
Contract costs, net, beginning of period 8 5
Change in scope 2 0
Contract costs capitalized 2 1
Amortization of contract costs (1) (1)
Contract costs, net, end of period 5 5
Gross Carrying Amount, Non-current    
Contract Assets [Line Items]    
Contract assets, net 18 6
Gross Carrying Amount, Current    
Contract Assets [Line Items]    
Contract assets, net 54 28
Provisions    
Contract Assets [Line Items]    
Contract assets, net (4) (2)
Current contract liabilities    
Contract liabilities [abstract]    
Long-term portion 2 2
Short-term portion 95 89
Total 97 $ 90
2020    
Contract liabilities [abstract]    
Transaction price allocated to remaining performance obligations 96  
2021    
Contract liabilities [abstract]    
Transaction price allocated to remaining performance obligations $ 6  
[1] The assets and liabilities of Tigo Guatemala are fully consolidated since the acquisition of the remaining 45% shareholding on November 12, 2021. See note A.1.2. for further details. As a result, numbers might not be directly comparable with previous years' figures.