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Capital structure and financing - C.3. Debt and financing (Details)
$ in Millions, $ in Millions
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Jan. 01, 2019
USD ($)
Jul. 31, 2018
USD ($)
Jul. 31, 2018
COP ($)
Disclosure of detailed information about borrowings [line items]          
Total non-current financing $ 5,631 $ 5,915      
Less: portion payable within one year (54) (129)      
Debt and financing – non-current 5,578 5,786 [1] $ 4,123    
Total non-current financing due after more than one year 59 57      
Debt and financing – current 113 186 [1] $ 458    
Borrowings 5,691 5,972      
Millicom International Cellular S.A. (Luxembourg)          
Disclosure of detailed information about borrowings [line items]          
Borrowings 2,504 2,773      
Colombia          
Disclosure of detailed information about borrowings [line items]          
Borrowings 803 827      
Paraguay          
Disclosure of detailed information about borrowings [line items]          
Borrowings 738 502      
Bolivia          
Disclosure of detailed information about borrowings [line items]          
Borrowings 337 350      
Panama          
Disclosure of detailed information about borrowings [line items]          
Borrowings 869 918      
Tanzania          
Disclosure of detailed information about borrowings [line items]          
Borrowings 203 186      
Costa Rica          
Disclosure of detailed information about borrowings [line items]          
Borrowings 119 148      
El Salvador          
Disclosure of detailed information about borrowings [line items]          
Borrowings 118 268      
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 4,253 4,067      
Total non-current financing due after more than one year 44 46      
Banks          
Disclosure of detailed information about borrowings [line items]          
Total non-current financing 1,337 1,805      
Total non-current financing due after more than one year 15 11      
Other Borrowings          
Disclosure of detailed information about borrowings [line items]          
Total non-current financing $ 41 $ 43      
[1] The consolidated statement of financial position at December 31, 2019 has been restated after finalization of the purchase accounting of our acquisitions in Nicaragua and Panama (note A.1.2.).