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The Millicom Group - A.1.2. Acquisition of subsidiaries and changes in non-controlling interests in subsidiaries, additional information (Details) - USD ($) $ in Millions |  | 2 Months Ended | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Jul. 31, 2024 | Dec. 31, 2025 | Dec. 31, 2025 | Dec. 31, 2025 | Oct. 30, 2025 | Oct. 07, 2025
Telefonica Colombia (Coltel) |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |
Percentage of controlling interest acquired | 67.50% |  |  |  |  |
Percentage ownership held by non-controlling interest | 32.50% |  |  |  |  |
Uruguay Acquisition |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |
Percentage of controlling interest acquired |  |  |  |  |  | 100.00%
Enterprise Value |  |  |  |  |  | $ 440
Revenue of acquiree since acquisition date |  |  | $ 63 |  |  |
Profit (loss) of acquiree since acquisition date |  |  | $ 3 |  |  |
Revenue of combined entity as if combination occurred at beginning of period |  |  |  | $ 169 |  |
Profit (loss) of combined entity as if combination occurred at beginning of period |  |  |  | 18 |  |
Ecuador Acquisition |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |
Percentage of controlling interest acquired |  |  |  |  | 100.00% |
Enterprise Value |  |  |  |  | $ 380 |
Revenue of acquiree since acquisition date |  | $ 81 |  |  |  |
Profit (loss) of acquiree since acquisition date |  | $ 1 |  |  |  |
Revenue of combined entity as if combination occurred at beginning of period |  |  |  | 404 |  |
Profit (loss) of combined entity as if combination occurred at beginning of period |  |  |  | $ 26 |  |

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