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The Millicom Group - A.1.4. Summarized financial information (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disclosure of subsidiaries [line items]      
Revenue $ 5,819 $ 5,804 $ 5,661
Operating profit 1,639 1,342 826
Net profit (loss) for the year 1,362 268 (245)
Non-controlling interest in net (loss) 46 15 (163)
Total assets (excluding goodwill) 17,253 13,737  
Total liabilities 13,633 10,163  
Non-controlling interests (20) (54)  
Net cash from operating activities 1,734 1,603 1,223
Net cash from (used in) investing activities (374) (604) (1,116)
Net cash from (used in) financing activities (485) (1,066) (377)
Exchange impact on cash and cash equivalents, net (14) (8) 6
Net increase (decrease) in cash and cash equivalents 861 (76) (264)
Colombia      
Disclosure of subsidiaries [line items]      
Revenue 1,450 1,380 1,313
Total operating expenses (493) (496) (501)
Operating profit 313 283 60
Net profit (loss) for the year $ 92 30 (326)
Proportion of voting rights held by non-controlling interests 50.00%    
Non-controlling interest in net (loss) $ 46 15 (163)
Total assets (excluding goodwill) 2,649 2,089 2,470
Total liabilities 2,653 2,177 2,605
Net assets (4) (87) (135)
Non-controlling interests (21) (55) (85)
Dividends and advances paid to non-controlling interest (2) 0 0
Net cash from operating activities 435 297 270
Net cash from (used in) investing activities (226) (175) (214)
Net cash from (used in) financing activities (124) (119) (54)
Exchange impact on cash and cash equivalents, net 6 (7) 2
Net increase (decrease) in cash and cash equivalents 91 (3) 5
Colombia | Before Consolidation Adjustments      
Disclosure of subsidiaries [line items]      
Non-controlling interests (2) (44) (68)
Colombia | Consolidation adjustments      
Disclosure of subsidiaries [line items]      
Non-controlling interests $ (19) $ (11) $ (17)