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Payables and Other Current Liabilities - Changes in Provision Law 18/2022 (Details) € in Millions | 12 Months Ended
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Dec. 31, 2022 EUR (€) invoice | Dec. 31, 2021 EUR (€) | Dec. 31, 2020 EUR (€)
Trade And Other Payables [Line Items] |  |  |
Total payments | € 29,509 | € 29,236 | € 31,080
Telefónica, S.A. |  |  |
Trade And Other Payables [Line Items] |  |  |
Total payments | 8,362 | € 7,671 |
Telefónica, S.A. | Law 18/2022 |  |  |
Trade And Other Payables [Line Items] |  |  |
Total payments | € 4,899 |  |
Payments To Suppliers For Goods And Services, To Total, Percentage | 0.59 |  |
Number of Invoices, Payments To Suppliers For Goods And Services | invoice | 157,523 |  |
Number of Invoices, Payments To Suppliers For Goods And Services, To Total, Percentage | 0.54 |  |

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