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The Millicom Group - A.1.3. Disposal of subsidiaries and decreases in non-controlling interests of subsidiaries (Details) - USD ($)
$ in Millions
 1 Months Ended 12 Months Ended
Apr. 05, 2022
Jun. 26, 2019
Aug. 31, 2020
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2016
Disclosure of analysis of single amount of discontinued operations [abstract]              
Cost of sales       $ (1,506) [1] $ (1,197) [2] $ (1,060) [2]  
Operating expenses       (1,890) [1] (1,546) [2] (1,383) [2]  
Depreciation and amortization       (1,344) (1,113) (1,119)  
Other operating income (expenses), net       (2) [1] 5 [2] (12) [2]  
Operating profit       915 [1] 619 [2] 402 [2]  
Other non-operating (expenses) income, net       (78) [1] (49) [2] (107) [2]  
Profit (loss) before taxes from continuing operations       238 [1] 728 [2],[3] (252) [2],[3]  
Net profit/(loss) from discontinued operations       113 [1] (28) [2] (60) [2]  
Cash Flow from Discontinued Operations [Abstract]              
Cash from operating activities, net       18 87 69  
Cash from (used in) investing activities, net       (10) (46) (43)  
Cash from (used in) financing activities, net       (9) (35) (34)  
Increase (decrease) in cash and cash equivalents, discontinued operations       (1) 5 (8)  
Tazania legislation requirement, OPA, percentage of shares (in percent)             25.00%
Discontinued operations              
Disclosure of analysis of single amount of discontinued operations [abstract]              
Revenue       88 357 366  
Cost of sales       (26) (104) (111)  
Operating expenses       (27) (131) (126)  
Depreciation and amortization       (21) (83) (89)  
Other operating income (expenses), net       4 1 (9)  
Gain/(loss) on disposal of discontinued operations       120 0 0  
Other expenses linked to the disposal of discontinued operations       (11) 0 (1)  
Operating profit       127 39 32  
Financial income (expenses), net (i)       (12) (36) (64)  
Other non-operating (expenses) income, net       0 (1) 1  
Profit (loss) before taxes from continuing operations       116 3 (31)  
Credit (charge) for taxes, net       (3) (31) (29)  
Net profit/(loss) from discontinued operations       $ 113 $ (28) $ (60)  
Discontinued operations | Discontinued Operations - Tanzania              
Disclosure of subsidiaries [line items]              
Total net assets $ (79)            
Consideration for disposal of operations 101            
Gross gain on sale (B) - (A) 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            
Discontinued operations | Discontinued Operations - Chad              
Cash Flow from Discontinued Operations [Abstract]              
Cash consideration for disposal of operations   $ 110          
Disposal group, price adjustment     $ 8        
[1] Tigo Guatemala is fully consolidated since the acquisition of the remaining 45% shareholding on November 12, 2021. See note A.1.2. for further details. As a result, numbers might not be directly comparable with previous years' figures.
[2] Re-presented for discontinued operations (see note A.4.)
[3] Re-presented for discontinued operations (see note A.4.).