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Capital structure and financing - C.3. Debt and financing (Details)
$ in Millions, $ in Millions
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Jul. 31, 2018
USD ($)
Jul. 31, 2018
COP ($)
Disclosure of detailed information about borrowings [line items]        
Total non-current financing $ 5,671 $ 6,508    
Less: portion payable within one year (138) (32)    
Debt and financing – non-current 5,533 6,476    
Total non-current financing due after more than one year 144 188    
Total 282 221    
Borrowings 5,815 6,697    
Millicom International Cellular S.A. (Luxembourg)        
Disclosure of detailed information about borrowings [line items]        
Borrowings 2,401 2,388    
Guatemala        
Disclosure of detailed information about borrowings [line items]        
Borrowings 1,233 1,463    
Colombia        
Disclosure of detailed information about borrowings [line items]        
Borrowings 554 713    
Paraguay        
Disclosure of detailed information about borrowings [line items]        
Borrowings 524 665    
Bolivia        
Disclosure of detailed information about borrowings [line items]        
Borrowings 153 246    
Panama        
Disclosure of detailed information about borrowings [line items]        
Borrowings 734 759    
Costa Rica        
Disclosure of detailed information about borrowings [line items]        
Borrowings 146 142    
El Salvador        
Disclosure of detailed information about borrowings [line items]        
Borrowings 71 174    
Nicaragua        
Disclosure of detailed information about borrowings [line items]        
Borrowings 0 148    
Bonds        
Disclosure of detailed information about borrowings [line items]        
Total non-current financing 4,418 4,638    
Total non-current financing due after more than one year 43 111    
Bank and Development Financial Institution        
Disclosure of detailed information about borrowings [line items]        
Total non-current financing 1,253 1,832    
Total non-current financing due after more than one year 68 59    
Other financing        
Disclosure of detailed information about borrowings [line items]        
Total non-current financing 38    
Total non-current financing due after more than one year $ 33 $ 18    
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%