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v3.26.1

The Millicom Group - A.1. Subsidiaries (Details) - entity | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Colombia |  |  |
Disclosure of subsidiaries [line items] |  |  |
Number of entities | 2 |  |
Colombia Móvil S.A. E.S.P. |  |  |
Disclosure of subsidiaries [line items] |  |  |
Proportion of ownership interest in subsidiary | 50.00% |  |
Proportion of voting rights held in subsidiary | 50.00% |  |
Comunicaciones Celulares S.A. |  |  |
Disclosure of subsidiaries [line items] |  |  |
Proportion of ownership interest in subsidiary | 100.00% | 100.00% | 100.00%
Grupo de Comunicaciones Digitales, S.A. (formerly Telefónica Móviles Panama, S.A.) |  |  |
Disclosure of subsidiaries [line items] |  |  |
Proportion of ownership interest in subsidiary | 100.00% | 100.00% | 100.00%
Millicom Cable Costa Rica S.A. |  |  |
Disclosure of subsidiaries [line items] |  |  |
Proportion of ownership interest in subsidiary | 100.00% | 100.00% | 100.00%
Millicom International Operations B.V. |  |  |
Disclosure of subsidiaries [line items] |  |  |
Proportion of ownership interest in subsidiary | 100.00% | 100.00% | 100.00%
Millicom International Services LLC |  |  |
Disclosure of subsidiaries [line items] |  |  |
Proportion of ownership interest in subsidiary | 100.00% | 100.00% | 100.00%
Millicom LIH S.A. |  |  |
Disclosure of subsidiaries [line items] |  |  |
Proportion of ownership interest in subsidiary | 100.00% | 100.00% | 100.00%
Millicom International Operations S.A. |  |  |
Disclosure of subsidiaries [line items] |  |  |
Proportion of ownership interest in subsidiary | 100.00% | 100.00% | 100.00%
Millicom Spain S.L. |  |  |
Disclosure of subsidiaries [line items] |  |  |
Proportion of ownership interest in subsidiary | 100.00% | 100.00% | 100.00%
Millicom Telecommunications S.A. |  |  |
Disclosure of subsidiaries [line items] |  |  |
Proportion of ownership interest in subsidiary | 100.00% | 100.00% | 100.00%
Navega.com S.A. |  |  |
Disclosure of subsidiaries [line items] |  |  |
Proportion of ownership interest in subsidiary | 100.00% | 100.00% | 100.00%
Otecel, S.A. |  |  |
Disclosure of subsidiaries [line items] |  |  |
Proportion of ownership interest in subsidiary | 100.00% |  |
Servicios Especializados en Telecomunicaciones, S.A. |  |  |
Disclosure of subsidiaries [line items] |  |  |
Proportion of ownership interest in subsidiary | 100.00% | 100.00% | 100.00%
Servicios Innovadores de Comunicación y Entretenimiento, S.A. |  |  |
Disclosure of subsidiaries [line items] |  |  |
Proportion of ownership interest in subsidiary | 100.00% | 100.00% | 100.00%
Telecomunicaciones Digitales, S.A. (formerly Cable Onda S.A.) |  |  |
Disclosure of subsidiaries [line items] |  |  |
Proportion of ownership interest in subsidiary | 100.00% | 100.00% | 100.00%
Telefónica Celular de Bolivia S.A. |  |  |
Disclosure of subsidiaries [line items] |  |  |
Proportion of ownership interest in subsidiary | 100.00% | 100.00% | 100.00%
Telefonía Celular de Nicaragua S.A. |  |  |
Disclosure of subsidiaries [line items] |  |  |
Proportion of ownership interest in subsidiary | 100.00% | 100.00% | 100.00%
Telefónica Celular del Paraguay S.A. |  |  |
Disclosure of subsidiaries [line items] |  |  |
Proportion of ownership interest in subsidiary | 100.00% | 100.00% | 100.00%
Telemóvil El Salvador S.A. de C.V. |  |  |
Disclosure of subsidiaries [line items] |  |  |
Proportion of ownership interest in subsidiary | 100.00% | 100.00% | 100.00%
Telefónica Móviles de Uruguay S.A. |  |  |
Disclosure of subsidiaries [line items] |  |  |
Proportion of ownership interest in subsidiary | 100.00% |  |
UNE EPM Telecomunicaciones S.A. and subsidiaries |  |  |
Disclosure of subsidiaries [line items] |  |  |
Proportion of ownership interest in subsidiary | 50.00% |  |
Proportion of voting rights held in subsidiary | 50.00% |  |

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- Definition The proportion of ownership interest in a subsidiary attributable to the entity. [Refer: Total for all subsidiaries [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 27 -IssueDate 2025-01-01 -Paragraph 17 -Subparagraph b -Clause iii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=27&code=ifrs-tx-2025-en-r&anchor=para_17_b_iii&doctype=Standard -URIDate 2025-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 27 -IssueDate 2025-01-01 -Paragraph 16 -Subparagraph b -Clause iii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=27&code=ifrs-tx-2025-en-r&anchor=para_16_b_iii&doctype=Standard -URIDate 2025-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2025-01-01 -Paragraph 19B -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2025-en-r&anchor=para_19B_c&doctype=Standard -URIDate 2025-03-27 + Details
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