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The Millicom Group - A.1.3. Disposal of subsidiaries, additional information (Details)
$ in Millions
 3 Months Ended 12 Months Ended
Oct. 27, 2025
USD ($)
Jun. 03, 2025
USD ($)
Oct. 28, 2024
USD ($)
site
tower
Feb. 26, 2024
operator
Jan. 24, 2024
USD ($)
tower
batches
Mar. 31, 2025
USD ($)
Dec. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Disclosure of subsidiaries [line items]                  
Net proceeds from the disposal of subsidiaries and associates             $ 781 $ 5 $ 0
Sale of Lati Operations             741 0 0
Right of use assets, net             2,346 792 896
Lease liabilities             2,587 954  
Number of operators | operator       2          
Other operating income (expenses), net             68 54 $ 10
Liabilities directly associated with assets held for sale             0 709  
NetCo (UNIRED)                  
Disclosure of subsidiaries [line items]                  
Other operating income (expenses), net             28    
Colombia Móvil S.A. E.S.P. | NetCo (UNIRED)                  
Disclosure of subsidiaries [line items]                  
Proportion of ownership interest in joint operation       50.00%          
Gains (losses) recognised in profit or loss attributable to change in unrealised gains or losses for assets held at end of period, fair value measurement           $ 15      
Colombia Móvil S.A. E.S.P. | NetCo (UNIRED) | Lease liabilities                  
Disclosure of subsidiaries [line items]                  
Proceeds from disposal of non-current assets or disposal groups classified as held for sale and discontinued operations             104    
Liabilities directly associated with assets held for sale             405 0  
Colombia Móvil S.A. E.S.P. | NetCo (UNIRED) | Property, plant and equipment                  
Disclosure of subsidiaries [line items]                  
Proceeds from disposal of non-current assets or disposal groups classified as held for sale and discontinued operations             3    
Non-current assets or disposal groups classified as held for sale             174 116  
Colombia Móvil S.A. E.S.P. | NetCo (UNIRED) | Right-of-use assets                  
Disclosure of subsidiaries [line items]                  
Proceeds from disposal of non-current assets or disposal groups classified as held for sale and discontinued operations             76    
Non-current assets or disposal groups classified as held for sale             $ 391 0  
Colombia Móvil S.A. E.S.P. | Unión Temporal (UT)                  
Disclosure of subsidiaries [line items]                  
Proportion of ownership interest in joint operation       50.00%     50.00%    
Disposal of proportion of ownership interest in joint operation       50.00%          
Colombia Móvil S.A. E.S.P. | Unión Temporal (UT) | Spectrum License Assets                  
Disclosure of subsidiaries [line items]                  
Proceeds from disposal of non-current assets or disposal groups classified as held for sale and discontinued operations             $ 604    
Non-current assets or disposal groups classified as held for sale             583 115  
Colombia Móvil S.A. E.S.P. | Unión Temporal (UT) | Spectrum License Liabilities                  
Disclosure of subsidiaries [line items]                  
Proceeds from disposal of non-current assets or disposal groups classified as held for sale and discontinued operations             696    
Non-current assets or disposal groups classified as held for sale             697 $ 103  
Colombia Móvil S.A. E.S.P. | Unión Temporal (UT) | Spectrum License                  
Disclosure of subsidiaries [line items]                  
Difference towards former book value             42    
Book value             $ 302    
Telefonica Colombia (Coltel) | NetCo (UNIRED)                  
Disclosure of subsidiaries [line items]                  
Proportion of ownership interest in joint operation       50.00%          
Telefonica Colombia (Coltel) | Unión Temporal (UT)                  
Disclosure of subsidiaries [line items]                  
Proportion of ownership interest in joint operation       50.00%          
Disposal groups classified as held for sale | Colombia Móvil S.A. E.S.P.                  
Disclosure of subsidiaries [line items]                  
Number of wireless communication towers | tower         1,132        
Proceeds from sales of investment property         $ 77        
Receivables from sale of properties         $ 26        
Number of batches | batches         3        
Lati International S.A and other assets                  
Disclosure of subsidiaries [line items]                  
Number of wireless communication towers | tower     7,000            
Leaseback agreement, period     15 years            
Number of sites, build-to-suit agreement | site     2,500            
Proceeds from sales of investment property     $ 52            
Gains or losses arising from sale and leaseback transactions     $ 13            
Net proceeds from the disposal of subsidiaries and associates   $ 975              
Sale of Lati Operations   741              
Right of use assets, net   680              
Lease liabilities   $ 680              
Lati International S.A and other assets | Lati honduras towers                  
Disclosure of subsidiaries [line items]                  
Proceeds from sales of investment property $ 75                
Results for the year $ 50