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Basis of Presentation of the Consolidated Financial Statements - Agreement Between Telefonica and Liberty Global plc to Combine Their Operating Businesses in the UK (Details) € in Millions, £ in Millions |  |  |  | 7 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Dec. 31, 2021 | Jun. 01, 2021 EUR (€) | Jun. 01, 2021 GBP (£) | May 07, 2020 | Dec. 31, 2021 | Dec. 31, 2022 EUR (€) | Dec. 31, 2021 EUR (€) | Dec. 31, 2020 EUR (€)
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |
Gain on disposal of businesses |  |  |  |  |  | € 205 | € 11,008 | € 67
Reclassification adjustments on accumulated actuarial losses |  |  |  |  |  | € 0 | € 392 | € 0
Telefónica O2 Holdings Ltd. Holding company |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |
Gain on disposal of businesses |  | € 4,460 |  |  |  |  |  |
Telefónica United Kingdom |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |
Reclassification adjustments on accumulated actuarial losses |  | 392 |  |  |  |  |  |
VMO2 |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |
Proportion of ownership interest in joint venture (as a percent) | 50.00% |  |  |  | 50.00% | 50.00% | 50.00% |
Proceeds from sales of investments accounted for using equity method |  | € 6,234 | £ 5,376 |  |  |  |  |
Proceeds from equalization payment | £ |  |  | 2,622 |  |  |  |  |
Proceeds from recapitalization of joint venture | £ |  |  | £ 2,754 |  |  |  |  |
VMO2 | Telefónica O2 Holdings Ltd. Holding company |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |
Proportion of ownership interest in joint venture (as a percent) |  | 50.00% | 50.00% | 50.00% |  |  |  |

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