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Long-term assets - E.4.2. Millicom's assets held for sale (Details) - USD ($)
$ in Millions
 12 Months Ended
Jun. 26, 2019
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure Of Detailed Information About Assets Classified As Held For Sale [Line Items]        
Liabilities included in disposal groups classified as held for sale   $ 0 [1] $ 0  
Foreign exchange gain (loss)   (43) (69) $ (32)
Cash and cash equivalents classified as part of disposal group held for sale   0 [2] 0 9
Discontinued operations [Abstract]        
Cost of sales   (1,302) [3] (1,171) (1,201)
Operating expenses   (1,677) [3] (1,505) (1,604)
Depreciation and amortization   (1,196) (1,208) (1,100)
Other operating income (expenses), net   6 [3] (12) (34)
Operating profit   659 [3] 446 575
Other non-operating (expenses) income, net   (50) [3] (106) 227
Profit (loss) before taxes from continuing operations   732 [2],[3] (271) 218
Net profit/(loss) from discontinuing operations   0 [3] (12) 57
Total assets of held for sale        
Disclosure Of Detailed Information About Assets Classified As Held For Sale [Line Items]        
Non-current assets or disposal groups classified as held for sale   0 1  
Liabilities included in disposal groups classified as held for sale   0 0  
Assets (Liabilities) Classified As Held For Sale   0 1  
Discontinued operations        
Discontinued operations [Abstract]        
Revenue   0 0 50
Cost of sales   0 0 (14)
Operating expenses   0 (4) (2)
Depreciation and amortization   0 0 (11)
Other operating income (expenses), net   0 0 0
Gain (loss) on disposal of discontinued operations   0 0 (74)
Other expenses linked to the disposal of discontinued operations   0 (9) (10)
Operating profit   0 (12) 88
Interest income (expense), net   0 0 (2)
Other non-operating (expenses) income, net   0 0 0
Profit (loss) before taxes from continuing operations   0 (12) 86
Credit (charge) for taxes, net   0 0 (2)
Net profit/(loss) from discontinuing operations   0 (12) 84
Cash flows from discontinued operations [abstract]        
Cash from (used in) operating activities, net   0 0 (8)
Cash from (used in) investing activities, net   0 0 5
Cash from (used in) financing activities, net   0 0 7
Discontinued operations | Discontinued Operations - Chad        
Discontinued operations [Abstract]        
Gain (loss) on disposal of discontinued operations $ (77)      
Discontinued operations | Discontinued Operations - Rwanda        
Discontinued operations [Abstract]        
Gain (loss) on disposal of discontinued operations       $ 32
Discontinued operations | Total assets of held for sale | Discontinued Operations, Towers Colombia        
Disclosure Of Detailed Information About Assets Classified As Held For Sale [Line Items]        
Non-current assets or disposal groups classified as held for sale   0 1  
Discontinued operations | Total assets of held for sale | Discontinued Operations, Towers El Salvador        
Disclosure Of Detailed Information About Assets Classified As Held For Sale [Line Items]        
Non-current assets or disposal groups classified as held for sale   0 0  
Discontinued operations | Total assets of held for sale | Discontinued Operations, Towers Zantel        
Disclosure Of Detailed Information About Assets Classified As Held For Sale [Line Items]        
Non-current assets or disposal groups classified as held for sale   $ 0 $ 0  
[1] The assets and liabilities of Tigo Guatemala are 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] The cash flows of Tigo Guatemala are 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.
[3] (i)    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.