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The Millicom Group - A.2. Joint arrangements (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Disclosure of joint ventures [line items] |  |  |
Statutory reserves unavailable for distribution | $ 661 | $ 562 | $ 491
Amounts payable | 427 | 170 |
Amounts receivable | $ 22 | 15 |
Honduras joint ventures |  |  |
Disclosure of joint ventures [line items] |  |  |
Proportion of ownership interest in joint venture | 50.00% |  |
Honduras joint ventures | Joint ventures where entity is venturer |  |  |
Disclosure of joint ventures [line items] |  |  |
Amounts payable | $ 192 | 133 |
Amounts receivable | 19 | 12 |
Total for all joint ventures |  |  |
Disclosure of joint ventures [line items] |  |  |
Total net assets | 426 | 373 |
Statutory reserves unavailable for distribution | 3 | 3 |
Honduras joint ventures |  |  |
Disclosure of joint ventures [line items] |  |  |
Total net assets | 52 | (25) | $ (35)
Cash repatriated from joint venture | $ 123 | $ 89 |
Proportion of ownership interest in joint venture | 66.70% | 66.70% | 66.70%
Increase (Decrease) Joint Ventures [Roll Forward] |  |  |
Investments in joint ventures | $ 561 | $ 576 |
Results for the year | 102 | 54 | $ 42
Dividends declared during the year | (51) | (48) |
Currency exchange differences | (29) | (21) |
Investments in joint ventures | $ 583 | $ 561 | $ 576
Telefonica Celular S.A |  |  |
Disclosure of joint ventures [line items] |  |  |
Proportion of ownership interest in joint venture | 66.70% | 66.70% |
Navega S.A. de CV |  |  |
Disclosure of joint ventures [line items] |  |  |
Proportion of ownership interest in joint venture | 66.70% | 66.70% |

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