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Associates and Joint Ventures - Breakdown of Key Financial Highlights Narrative (Details) | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
HoldCo Infraco SpA. (Onnet Fibra Chile) |  |
Disclosure Of Joint Ventures And Associates [Line Items] |  |
Proportion of ownership interest in joint venture | 40.00% | 40.00%
Proportion of ownership interest in associate (as a percent) | 40.00% |
Unsere Grüne Glasfaser (UGG) |  |
Disclosure Of Joint Ventures And Associates [Line Items] |  |
Proportion of ownership interest in joint venture | 50.00% | 50.00%
Percentage of operation financed | 1 |
Unsere Grüne Glasfaser (UGG) | Allianz |  |
Disclosure Of Joint Ventures And Associates [Line Items] |  |
Proportion of ownership interest in joint venture | 50.00% |
Opal Jvco Limited (nexfibre) |  |
Disclosure Of Joint Ventures And Associates [Line Items] |  |
Proportion of ownership interest in joint venture | 25.00% | 25.00%
Opal Jvco Limited (nexfibre) | Liberty Global and Telefónica |  |
Disclosure Of Joint Ventures And Associates [Line Items] |  |
Proportion of ownership interest in joint venture | 50.00% |
Opal Jvco Limited (nexfibre) | InfraVia Capital Partners |  |
Disclosure Of Joint Ventures And Associates [Line Items] |  |
Proportion of ownership interest in joint venture | 50.00% |

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- Definition The proportion of ownership interest in an associate attributable to the entity. [Refer: Total for all associates [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 27 -IssueDate 2024-01-01 -Paragraph 17 -Subparagraph b -Clause iii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=27&code=ifrs-tx-2024-en-r&anchor=para_17_b_iii&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 27 -IssueDate 2024-01-01 -Paragraph 16 -Subparagraph b -Clause iii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=27&code=ifrs-tx-2024-en-r&anchor=para_16_b_iii&doctype=Standard -URIDate 2024-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2024-01-01 -Paragraph 21 -Subparagraph a -Clause iv -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2024-en-r&anchor=para_21_a_iv&doctype=Standard -URIDate 2024-03-27 + Details
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