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The Millicom Group - A.2. Joint arrangements (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disclosure of joint ventures [line items]      
Statutory reserves unavailable for distribution $ 661 $ 562 $ 491
Amounts payable 427 170  
Amounts receivable $ 22 15  
Honduras joint ventures      
Disclosure of joint ventures [line items]      
Proportion of ownership interest in joint venture 50.00%    
Honduras joint ventures | Joint ventures where entity is venturer      
Disclosure of joint ventures [line items]      
Amounts payable $ 192 133  
Amounts receivable 19 12  
Total for all joint ventures      
Disclosure of joint ventures [line items]      
Total net assets 426 373  
Statutory reserves unavailable for distribution 3 3  
Honduras joint ventures      
Disclosure of joint ventures [line items]      
Total net assets 52 (25) $ (35)
Cash repatriated from joint venture $ 123 $ 89  
Proportion of ownership interest in joint venture 66.70% 66.70% 66.70%
Increase (Decrease) Joint Ventures [Roll Forward]      
Investments in joint ventures $ 561 $ 576  
Results for the year 102 54 $ 42
Dividends declared during the year (51) (48)  
Currency exchange differences (29) (21)  
Investments in joint ventures $ 583 $ 561 $ 576
Telefonica Celular S.A      
Disclosure of joint ventures [line items]      
Proportion of ownership interest in joint venture 66.70% 66.70%  
Navega S.A. de CV      
Disclosure of joint ventures [line items]      
Proportion of ownership interest in joint venture 66.70% 66.70%