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Business combinations - 2022 Acquisition of mobile assets of Oi Group Narrative (Details) € in Millions, client in Millions, R$ in Millions |  |  | 12 Months Ended |  |  |
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Oct. 23, 2023 EUR (€) | Oct. 23, 2023 BRL (R$) | Apr. 20, 2022 EUR (€) client siteOfMobileAccess | Apr. 20, 2022 BRL (R$) | Dec. 31, 2023 EUR (€) | Dec. 31, 2024 EUR (€) | Dec. 31, 2023 BRL (R$) | Apr. 20, 2022 BRL (R$) client siteOfMobileAccess
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |
Current financial assets |  |  |  |  | € 1,078 | € 1,800 |  |
Deposits and guarantees |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |
Current financial assets |  |  |  |  | 209 | € 139 |  |
Telefónica Brasil, Claro S.A. And TIM S.A. | Deposits and guarantees |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |
Current financial assets |  |  |  |  | 94 |  | R$ 522 |
Oi Group |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |
Number of clients recognised as of acquisition date | client |  |  | 12.5 |  |  |  |  | 12.5
Number of clients recognised as of acquisition date, (in percentage of total customers) |  |  | 0.30 |  |  |  |  | 0.30
Spectrum recognised as of acquisition date, percentage of radiofrequency (in percentage) |  |  | 0.46 |  |  |  |  | 0.46
Infrastructure contracts recognised as of acquisition date | siteOfMobileAccess |  |  | 2,700 |  |  |  |  | 2,700
Infrastructure contracts recognised as of acquisition date, percentage |  |  | 19 |  |  |  |  | 19
Fair value of acquired receivables |  |  | € 74 |  |  |  |  |
Gross contractual amounts receivable for acquired receivables |  |  | 81 |  |  |  |  |
Best estimate at acquisition date of contractual cash flows not expected to be collected for acquired receivables |  |  | 7 |  |  |  |  |
Contingent liabilities recognised as of acquisition date |  |  | 90 |  |  |  |  |
Revenue of acquiree since acquisition date |  |  |  |  | 206 |  |  |
Loss of acquiree since acquisition date |  |  |  |  | € 1 |  |  |
Consideration |  | R$ 5,129 | 1,093 |  |  |  |  | R$ 5,492
Cash transferred, estimation |  |  | € 1,063 | R$ 5,373 |  |  |  |
Retained amount, percentage |  | 50.00% |  |  |  |  |  |
Cash transferred, retained amount | R$ |  | R$ 488 |  |  |  |  |  |
Withdrawn amount, percentage |  | 50.00% |  |  |  |  |  |
Withdrawn amount | € 51 | R$ 277 |  |  |  |  |  |
Oi Group | Minimum | Licenses |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |
Useful life measured as period of time, intangible assets other than goodwill |  |  |  |  | 5 years |  |  |
Oi Group | Maximum | Licenses |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |
Useful life measured as period of time, intangible assets other than goodwill |  |  |  |  | 15 years |  |  |
Oi Group | Weighted average | Licenses |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |
Useful life measured as period of time, intangible assets other than goodwill |  |  |  |  | 10 years 29 days |  |  |

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