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The Millicom Group - A.1.2. Acquisition of subsidiaries and changes in non-controlling interests in subsidiaries Narrative (Details) - USD ($)
$ in Millions
 2 Months Ended 10 Months Ended 12 Months Ended
Jun. 29, 2022
Dec. 31, 2021
Nov. 12, 2021
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of detailed information about business combination [line items]            
Put option liability   $ 290 [1]   $ 0 $ 290 [1]  
Effect of the buy-out of non-controlling interest in Panama [2]       0    
Total            
Disclosure of detailed information about business combination [line items]            
Effect of the buy-out of non-controlling interest in Panama $ 78     $ 78 [2]    
Guatemala joint ventures            
Disclosure of detailed information about business combination [line items]            
Proportion of ownership interest in subsidiary     55.00% 100.00% 55.00% 55.00%
Telecomunicaciones Digitales, S.A.            
Disclosure of detailed information about business combination [line items]            
Percentage of controlling interest acquired 20.00%          
Acquisition price $ 290          
Put option liability $ 290          
Guatemala joint ventures            
Disclosure of detailed information about business combination [line items]            
Percentage of controlling interest acquired     45.00%      
Acquisition price   2,195 $ 2,195   $ 2,195  
Acquisition-date fair value     $ 2,683      
Revenue of acquiree since acquisition date   223        
Net profit (loss) of acquiree since acquisition date   $ 43        
Revenue of combined entity as if combination occurred at beginning of period         1,380  
Profit (loss) of combined entity as if combination occurred at beginning of period         $ 147  
[1] Restated after the finalization of the Guatemala purchase accounting. See note A.1.2. for further details.
[2] Resulting from the exercise of the put option in Panama, see note A.1.2.