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The Millicom Group - A.1.2. Acquisition of subsidiaries and changes in non-controlling interests in subsidiaries, additional information (Details) - USD ($)
$ in Millions
 2 Months Ended 3 Months Ended 12 Months Ended
Jul. 31, 2024
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Oct. 30, 2025
Oct. 07, 2025
Telefonica Colombia (Coltel)            
Disclosure of detailed information about business combination [line items]            
Percentage of controlling interest acquired 67.50%          
Percentage ownership held by non-controlling interest 32.50%          
Uruguay Acquisition            
Disclosure of detailed information about business combination [line items]            
Percentage of controlling interest acquired           100.00%
Enterprise Value           $ 440
Revenue of acquiree since acquisition date     $ 63      
Profit (loss) of acquiree since acquisition date     $ 3      
Revenue of combined entity as if combination occurred at beginning of period       $ 169    
Profit (loss) of combined entity as if combination occurred at beginning of period       18    
Ecuador Acquisition            
Disclosure of detailed information about business combination [line items]            
Percentage of controlling interest acquired         100.00%  
Enterprise Value         $ 380  
Revenue of acquiree since acquisition date   $ 81        
Profit (loss) of acquiree since acquisition date   $ 1        
Revenue of combined entity as if combination occurred at beginning of period       404    
Profit (loss) of combined entity as if combination occurred at beginning of period       $ 26