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Performance B.6.3. Deferred tax (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Reconciliation of changes in deferred tax liability (asset) [abstract]      
Beginning of period $ 4 $ 1  
Deferred tax assets 167 153 $ 141
Deferred tax liabilities (149) (149) (140)
Acquisitions (3)    
(Charge)/credit to income statement 58 3  
Charge to Other Comprehensive Income 0 0  
Exchange differences (41) 0  
End of period 18 4  
Deductible temporary differences 5,531 5,987  
Unrecognized tax losses 5,226 5,705  
Temporary differences associated with investments in subsidiaries, branches and associates and interests in joint arrangements for which deferred tax liabilities have not been recognised 1,313    
Deferred tax liabilities 149 149 140
Deferred tax liabilities, intragroup dividends 39 44 26
Millicom International Cellular S.A.      
Reconciliation of changes in deferred tax liability (asset) [abstract]      
Unrecognized tax losses 4,800    
Unrecognized tax losses, expiring 17 years 1,300    
Unrecognized tax losses that do not expire 3,500    
Luxembourg      
Reconciliation of changes in deferred tax liability (asset) [abstract]      
Unrecognized tax losses 4,848 5,283  
Colombia      
Reconciliation of changes in deferred tax liability (asset) [abstract]      
Unrecognized tax losses 361 379  
Sweden      
Reconciliation of changes in deferred tax liability (asset) [abstract]      
Unrecognized tax losses 1 15  
Panama      
Reconciliation of changes in deferred tax liability (asset) [abstract]      
Unrecognized tax losses 8 22  
The Netherlands      
Reconciliation of changes in deferred tax liability (asset) [abstract]      
Unrecognized tax losses 3 3  
Bolivia      
Reconciliation of changes in deferred tax liability (asset) [abstract]      
Unrecognized tax losses 3 3  
Curacao      
Reconciliation of changes in deferred tax liability (asset) [abstract]      
Unrecognized tax losses 0 1  
United Kingdom      
Reconciliation of changes in deferred tax liability (asset) [abstract]      
Unrecognized tax losses 1 1  
Offset      
Reconciliation of changes in deferred tax liability (asset) [abstract]      
Deferred tax assets 14 25 11
Deferred tax liabilities (14) (25) (11)
Deferred tax liabilities 14 25 11
Fixed assets      
Reconciliation of changes in deferred tax liability (asset) [abstract]      
Beginning of period (23) (33)  
Acquisitions 4    
(Charge)/credit to income statement 21 10  
Charge to Other Comprehensive Income 1 0  
Exchange differences (19) 0  
End of period (16) (23)  
Deductible temporary differences 119 112  
Fixed assets | Before Offset      
Reconciliation of changes in deferred tax liability (asset) [abstract]      
Deferred tax assets 76 92 88
Deferred tax liabilities (92) (115) (121)
Deferred tax liabilities 92 115 121
Unused tax losses      
Reconciliation of changes in deferred tax liability (asset) [abstract]      
Beginning of period 0 0  
Acquisitions 0    
(Charge)/credit to income statement 0 0  
Charge to Other Comprehensive Income 0 0  
Exchange differences 0 0  
End of period 0 0  
Deductible temporary differences 5,226 5,705  
Unused tax losses | Before Offset      
Reconciliation of changes in deferred tax liability (asset) [abstract]      
Deferred tax assets 0 0
Deferred tax liabilities 0 0
Deferred tax liabilities 0 0
Unremitted earnings      
Reconciliation of changes in deferred tax liability (asset) [abstract]      
Beginning of period (47) (26)  
Deferred tax liabilities 0 (803) (672)
Acquisitions 0    
(Charge)/credit to income statement 8 (21)  
Charge to Other Comprehensive Income 0 0  
Exchange differences 0 0  
End of period (39) (47)  
Deferred tax liabilities 0 803 672
Unremitted earnings | Before Offset      
Reconciliation of changes in deferred tax liability (asset) [abstract]      
Deferred tax assets 0 0 0
Deferred tax liabilities (39) (47) (26)
Deferred tax liabilities 39 47 26
Other      
Reconciliation of changes in deferred tax liability (asset) [abstract]      
Beginning of period 74 60  
Acquisitions (7)    
(Charge)/credit to income statement 29 14  
Charge to Other Comprehensive Income (1) 0  
Exchange differences (22) 0  
End of period 73 74  
Deductible temporary differences 186 170  
Other | Before Offset      
Reconciliation of changes in deferred tax liability (asset) [abstract]      
Deferred tax assets 105 86 64
Deferred tax liabilities (32) (12) (4)
Deferred tax liabilities 32 12 $ 4
Within one year      
Reconciliation of changes in deferred tax liability (asset) [abstract]      
Unrecognized tax losses 0 1  
Within one to five years      
Reconciliation of changes in deferred tax liability (asset) [abstract]      
Unrecognized tax losses 12 25  
Between five to fifteen years      
Reconciliation of changes in deferred tax liability (asset) [abstract]      
Unrecognized tax losses 1,625 1,715  
No expiry      
Reconciliation of changes in deferred tax liability (asset) [abstract]      
Unrecognized tax losses $ 3,589 $ 3,964