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Cash Flow Detail - Investing Activities, Proceeds and Payments on Financial Investments (Details) - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Disclosure of associates [line items] |  |  |
Proceeds on financial investments not included under cash equivalents | € 2,967 | € 2,163 | € 2,308
Payments on financial investments not included under cash equivalents | (2,575) | (1,474) | (3,297)
Collateral guarantees on derivatives |  |  |
Disclosure of associates [line items] |  |  |
Proceeds on financial investments not included under cash equivalents | 2,891 | 1,897 | 2,224
Payments on financial investments not included under cash equivalents | (2,195) | (1,228) | (3,251)
Legal deposits |  |  |
Disclosure of associates [line items] |  |  |
Proceeds on financial investments not included under cash equivalents | 3 | 125 | 63
Payments on financial investments not included under cash equivalents | (4) | (7) | 0
Investment in funds shares of Telefónica Brasil |  |  |
Disclosure of associates [line items] |  |  |
Payments on financial investments not included under cash equivalents | 0 | (117) | 0
Others |  |  |
Disclosure of associates [line items] |  |  |
Proceeds on financial investments not included under cash equivalents | 73 | 141 | 21
Payments on financial investments not included under cash equivalents | (116) | (122) | (46)
Long Term Financial Instrument |  |  |
Disclosure of associates [line items] |  |  |
Payments on financial investments not included under cash equivalents | € (260) | € 0 | € 0

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