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The Millicom Group - A.1.3. Disposal of subsidiaries (Details) - USD ($)
$ in Millions
 12 Months Ended
Apr. 05, 2022
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2016
Disclosure of analysis of single amount of discontinued operations [abstract]          
Revenue   $ 5,804 $ 5,661 $ 5,624  
Equipment, programming and other direct costs   (1,420) (1,507) (1,506)  
Operating expenses   (1,915) (2,043) (1,890)  
Other operating income (expenses), net   54 10 (2)  
Operating profit   1,342 826 915  
Interest income (expense), net   (670)      
Other non-operating (expenses) income, net   (119) 36 (78)  
Profit (loss) before taxes from continuing operations   552 175 238  
Net profit/(loss) from discontinued operations   (3) 4 113  
Cash Flow from Discontinued Operations [Abstract]          
Tazania legislation requirement, OPA, percentage of shares (in percent)         25.00%
Discontinued operations          
Disclosure of analysis of single amount of discontinued operations [abstract]          
Operating profit   $ (3) $ 4    
Discontinued operations | Discontinued operations - Tanzania          
Disclosure of subsidiaries [line items]          
Total net assets $ (79)        
Consideration for disposal of operations 101        
Gross gain on sale 180        
Other operating expenses linked to the disposal (11)        
Other operating income/expenses, net (5)        
Gain on sale before reclassification of foreign currency translation reserve 165        
Reclassification of foreign currency translation reserve (56)        
Net gain on sale $ 109        
Disclosure of analysis of single amount of discontinued operations [abstract]          
Revenue       88  
Equipment, programming and other direct costs       (26)  
Operating expenses       (27)  
Depreciation and amortization       (21)  
Other operating income (expenses), net       4  
Gain/(loss) on disposal of discontinued operations       120  
Other expenses linked to the disposal of discontinued operations       (11)  
Operating profit       127  
Interest income (expense), net       (12)  
Other non-operating (expenses) income, net       0  
Profit (loss) before taxes from continuing operations       116  
Tax expense       (3)  
Net profit/(loss) from discontinued operations       113  
Cash Flow from Discontinued Operations [Abstract]          
Cash from operating activities, net       18  
Cash from (used in) investing activities, net       (10)  
Cash from (used in) financing activities, net       (9)  
Increase (decrease) in cash and cash equivalents, discontinued operations       $ (1)