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Capital structure and financing - C.3. Debt and financing (Details) $ in Millions, $ in Millions | Dec. 31, 2025 USD ($) | Dec. 31, 2024 USD ($) | Jul. 31, 2018 COP ($)
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Disclosure of detailed information about borrowings [line items] |  |  |
Total non-current financing | $ 6,698 | $ 5,671 |
Less: portion payable within one year | (142) | (138) |
Total non-current financing due after more than one year | 6,556 | 5,533 |
Debt and financing due within one year | 188 | 144 |
Total | 329 | 282 |
Total debt and financing | 6,886 | 5,815 |
Millicom International Cellular S.A. (Luxembourg) |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Total debt and financing | 2,416 | 2,401 |
Guatemala |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Total debt and financing | 1,602 | 1,233 |
Colombia |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Total debt and financing | 620 | 554 |
Paraguay |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Total debt and financing | 705 | 524 |
Bolivia |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Total debt and financing | 128 | 153 |
Panama |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Total debt and financing | 734 | 734 |
Costa Rica |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Total debt and financing | 148 | 146 |
El Salvador |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Total debt and financing | 248 | 71 |
Nicaragua |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Total debt and financing | 0 | 0 |
Uruguay |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Total debt and financing | 201 |  |
Ecuador |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Total debt and financing | 83 |  |
Bonds |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Total non-current financing | 4,414 | 4,418 |
Debt and financing due within one year | 137 | 43 |
Bank and Development Financial Institution |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Total non-current financing | 2,284 | 1,253 |
Debt and financing due within one year | 51 | 68 |
Other financing |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Debt and financing due within one year | $ 0 | $ 33 |
Bilateral facility with IIC |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Borrowings face amount |  |  | $ 144,054.5

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