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Capital structure and financing - C.3. Debt and financing (Details)
$ in Millions, $ in Millions
Dec. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
Jul. 31, 2018
COP ($)
Disclosure of detailed information about borrowings [line items]      
Total non-current financing $ 6,698 $ 5,671  
Less: portion payable within one year (142) (138)  
Total non-current financing due after more than one year 6,556 5,533  
Debt and financing due within one year 188 144  
Total 329 282  
Total debt and financing 6,886 5,815  
Millicom International Cellular S.A. (Luxembourg)      
Disclosure of detailed information about borrowings [line items]      
Total debt and financing 2,416 2,401  
Guatemala      
Disclosure of detailed information about borrowings [line items]      
Total debt and financing 1,602 1,233  
Colombia      
Disclosure of detailed information about borrowings [line items]      
Total debt and financing 620 554  
Paraguay      
Disclosure of detailed information about borrowings [line items]      
Total debt and financing 705 524  
Bolivia      
Disclosure of detailed information about borrowings [line items]      
Total debt and financing 128 153  
Panama      
Disclosure of detailed information about borrowings [line items]      
Total debt and financing 734 734  
Costa Rica      
Disclosure of detailed information about borrowings [line items]      
Total debt and financing 148 146  
El Salvador      
Disclosure of detailed information about borrowings [line items]      
Total debt and financing 248 71  
Nicaragua      
Disclosure of detailed information about borrowings [line items]      
Total debt and financing 0 0  
Uruguay      
Disclosure of detailed information about borrowings [line items]      
Total debt and financing 201    
Ecuador      
Disclosure of detailed information about borrowings [line items]      
Total debt and financing 83    
Bonds      
Disclosure of detailed information about borrowings [line items]      
Total non-current financing 4,414 4,418  
Debt and financing due within one year 137 43  
Bank and Development Financial Institution      
Disclosure of detailed information about borrowings [line items]      
Total non-current financing 2,284 1,253  
Debt and financing due within one year 51 68  
Other financing      
Disclosure of detailed information about borrowings [line items]      
Debt and financing due within one year $ 0 $ 33  
Bilateral facility with IIC      
Disclosure of detailed information about borrowings [line items]      
Borrowings face amount     $ 144,054.5