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The Millicom Group - A.1.3. Disposal of subsidiaries and decreases in non-controlling interests of subsidiaries (Details) - Discontinued operations - USD ($)
$ in Millions
 1 Months Ended 12 Months Ended
Jun. 26, 2019
Aug. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 19, 2017
Disclosure of subsidiaries [line items]            
Gain (loss) on disposal of discontinued operations     $ 0 $ 0 $ 74  
Discontinued Operations - Chad            
Disclosure of subsidiaries [line items]            
Cash consideration for disposal of operations $ 110          
Disposal group, price adjustment   $ 8        
Gain (loss) on disposal of discontinued operations $ 77          
Discontinued Operations - Rwanda            
Disclosure of subsidiaries [line items]            
Gain (loss) on disposal of discontinued operations         $ (32)  
Consideration for disposal of operations           $ 51
Deferred cash payment due           $ 18