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Capital structure and financing - C.3. Debt and financing (Details)
$ in Millions, $ in Millions
Dec. 31, 2021
USD ($)
Nov. 12, 2021
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Jul. 31, 2018
USD ($)
Jul. 31, 2018
COP ($)
Disclosure of detailed information about borrowings [line items]            
Total non-current financing $ 5,916   $ 5,631      
Less: portion payable within one year (12)   (54)      
Debt and financing – non-current 5,904 [1]   5,578      
Total non-current financing due after more than one year 1,828   59      
Debt and financing – current 1,840 [1]   113      
Borrowings 7,744   5,691      
Guatemala joint ventures            
Disclosure of detailed information about borrowings [line items]            
Debt and financing – non-current     619 $ 1,152    
Debt and financing – current     24 $ 21    
Percentage of controlling interest acquired   45.00%        
Millicom International Cellular S.A. (Luxembourg)            
Disclosure of detailed information about borrowings [line items]            
Borrowings 4,020   2,504      
Guatemala            
Disclosure of detailed information about borrowings [line items]            
Borrowings 605   0      
Colombia            
Disclosure of detailed information about borrowings [line items]            
Borrowings 802   803      
Paraguay            
Disclosure of detailed information about borrowings [line items]            
Borrowings 751   738      
Bolivia            
Disclosure of detailed information about borrowings [line items]            
Borrowings 310   337      
Panama            
Disclosure of detailed information about borrowings [line items]            
Borrowings 846   869      
Tanzania            
Disclosure of detailed information about borrowings [line items]            
Borrowings 189   203      
Costa Rica            
Disclosure of detailed information about borrowings [line items]            
Borrowings 121   119      
El Salvador            
Disclosure of detailed information about borrowings [line items]            
Borrowings 100   118      
Bilateral Facility With IIC            
Disclosure of detailed information about borrowings [line items]            
Borrowings face amount         $ 50 $ 144,054.5
Borrowings, interest rate         9.45% 9.45%
Bonds            
Disclosure of detailed information about borrowings [line items]            
Total non-current financing 4,030   4,253      
Total non-current financing due after more than one year 61   44      
Banks            
Disclosure of detailed information about borrowings [line items]            
Total non-current financing 1,851   1,337      
Total non-current financing due after more than one year 1,768   15      
Other Borrowings            
Disclosure of detailed information about borrowings [line items]            
Total non-current financing $ 36   $ 41      
[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.