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Other Information - Narrative (Details) € in Millions, R$ in Millions, Kč in Millions, $ in Millions |  |  | 12 Months Ended |  |  |  |  |  |
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Apr. 12, 2024 | Aug. 29, 2017 EUR (€) | Dec. 31, 2024 EUR (€) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 EUR (€) | Dec. 31, 2022 EUR (€) | Dec. 31, 2015 | Dec. 31, 2013 | Dec. 31, 2024 BRL (R$) | Dec. 31, 2024 USD ($) | Oct. 31, 2024 EUR (€) | Oct. 31, 2024 VEB (Bs.) | Feb. 13, 2024 USD ($) | May 31, 2018 EUR (€) | May 31, 2018 BRL (R$) | Jul. 25, 2017 EUR (€) | Aug. 05, 2016 EUR (€) | Aug. 05, 2016 CZK (Kč)
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other operating income and expenses |  |  | € 625 |  | € 428 | € 478 |  |  |  |  |  |  |  |  |  |  |  |
Current financial assets |  |  | 1,800 |  | 1,078 |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term credits |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current financial assets |  |  | 893 |  | € 192 |  |  |  |  |  |  |  |  |  |  |  |  |
Telefónica Venezolana, C.A. Wireless communications operator |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred prosecution agreement |  |  |  |  |  |  |  |  |  |  | € 81 | Bs. 85,260,000 |  |  |  |  |  |
Republic of Colombia |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other operating income and expenses |  |  | € 358 | $ 380 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Damages penalty percentage | 0.05 |  | 0.05 | 0.05 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Republic of Colombia | Short-term credits |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current financial assets |  |  | € 523 |  |  |  |  |  |  | $ 544 |  |  |  |  |  |  |  |
Legal proceedings contingent liability |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of interconnection revenues from contingent legal claim |  |  | 1.00% |  |  |  |  |  | 1.00% | 1.00% |  |  |  |  |  |  |  |
Legal proceedings contingent liability | Venten Management Limited |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated financial effect of contingent liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | € 23 | Kč 644
Legal proceedings contingent liability | Lexburg Enterprises Limited |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated financial effect of contingent liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | € 8 | Kč 227
Legal proceedings contingent liability | ANATEL |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated financial effect of contingent liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  | € 33 | R$ 211 |  |  |
Estimated effect after currency value update |  |  | € 103 |  |  |  |  |  | R$ 663 |  |  |  |  |  |  |  |  |
Legal proceedings contingent liability | ANATEL | Renewal of Radio Frequencies 2013 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated financial effect of contingent liabilities |  |  | 139 |  |  |  |  |  | 896 |  |  |  |  |  |  |  |  |
Renewal of radio frequencies associated with the provision of personal mobile services, term |  |  |  |  |  |  |  | 15 years |  |  |  |  |  |  |  |  |  |
Price renewal, renewal of radio frequencies associated with the provision of personal mobile services, term |  |  |  |  |  |  |  | 2 years |  |  |  |  |  |  |  |  |  |
Price renewal, renewal of radio frequencies associated with the provision of personal mobile services (in percentage) |  |  |  |  |  |  |  | 2.00% |  |  |  |  |  |  |  |  |  |
Legal proceedings contingent liability | ANATEL | Renewal of Radio Frequencies 2015 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated financial effect of contingent liabilities |  |  | € 36 |  |  |  |  |  | R$ 229 |  |  |  |  |  |  |  |  |
Renewal of radio frequencies associated with the provision of personal mobile services, term |  |  |  |  |  |  | 15 years |  |  |  |  |  |  |  |  |  |  |
Price renewal, renewal of radio frequencies associated with the provision of personal mobile services, term |  |  |  |  |  |  | 2 years |  |  |  |  |  |  |  |  |  |  |
Price renewal, renewal of radio frequencies associated with the provision of personal mobile services (in percentage) |  |  |  |  |  |  | 2.00% |  |  |  |  |  |  |  |  |  |  |
Legal proceedings contingent liability | Republic of Colombia |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated financial effect of contingent liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | € 470 |  |
Percent paid |  | 67.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount paid |  | € 317 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Damages penalty percentage |  |  | 0.05 | 0.05 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Legal proceedings contingent liability | Republic of Colombia | Colombian Government |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percent paid |  | 32.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount paid |  | € 153 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Legal proceedings contingent liability | Millicom International Cellular, S.A. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated financial effect of contingent liabilities | $ |  |  |  |  |  |  |  |  |  |  |  |  | $ 140 |  |  |  |  |

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