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Capital structure and financing - C.4. Lease liability (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Disclosure of share capital, reserves and other equity interest [Abstract]    
Current $ 171 [1] $ 123
Non-Current 996 [1] 897
Lease liabilities 1,167 1,021
Expense relating to short-term leases (included in cost of sales and operating expenses) 0 (1)
Total cash outflow for leases $ (277) $ (267)
[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.