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Capital structure and financing - C.5. Cash and deposits (Details) - USD ($)
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Cash and Cash Equivalents [Line Items]        
Cash and cash equivalents $ 895,000,000 [1],[2] $ 875,000,000 [2] $ 1,164,000,000 $ 528,000,000
Restricted cash 203,000,000 [1] 199,000,000    
Non-current financial assets pledged as collateral for contingent liabilities   0    
Debt denominated in US dollars        
Cash and Cash Equivalents [Line Items]        
Cash and cash equivalents 526,000,000 619,000,000    
Total debt denominated in other currencies        
Cash and Cash Equivalents [Line Items]        
Cash and cash equivalents 369,000,000 256,000,000    
Mobile Financial Services        
Cash and Cash Equivalents [Line Items]        
Restricted cash 197,000,000 192,000,000    
Other Banks        
Cash and Cash Equivalents [Line Items]        
Restricted cash $ 7,000,000 $ 7,000,000    
[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.
[2] The cash flows 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.