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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 |  |  |  |  |  |  |  |

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