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Capital structure and financing - C.6. Net financial obligations, table 1 (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Share Capital, Reserves And Other Equity Interest And Financial Instruments [Abstract]        
Total debt and financing $ 7,744 $ 5,691    
Lease liabilities 1,167 1,021    
Gross financial obligations 8,911 6,711    
Cash and cash equivalents (895) [1],[2] (875) [2] $ (1,164) $ (528)
Pledged deposits (35) 0    
Time deposits related to bank borrowings 0 0    
Net financial obligations at the end of the year 7,981 5,837 $ 5,902  
Add (less) derivatives related to debt (note D.1.2.) (20) (12)    
Net financial obligations including derivatives related to debt 7,961 5,825    
Restricted cash $ 203 [1] $ 199    
[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.