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Equity - Cash Flow Disclosures (Details) - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Entity Information [Line Items] |  |  |
Net cash flow provided by operating activities | € 10,994 | € 11,649 | € 11,763
Net cash flow used in investing activities | (5,223) | (4,286) | (5,327)
Net cash flow used in financing activities | (4,672) | (7,186) | (7,925)
Telefónica Brazil |  |  |
Entity Information [Line Items] |  |  |
Net cash flow provided by operating activities | 3,644 | 3,710 | 3,678
Net cash flow used in investing activities | (1,529) | (1,477) | (2,741)
Net cash flow used in financing activities | (1,557) | (1,709) | (1,674)
Telefónica Germany |  |  |
Entity Information [Line Items] |  |  |
Net cash flow provided by operating activities | 2,774 | 2,684 | 2,732
Net cash flow used in investing activities | (1,334) | (1,337) | (1,608)
Net cash flow used in financing activities | (1,586) | (1,498) | (1,339)
Colombia Telecomunicaciones |  |  |
Entity Information [Line Items] |  |  |
Net cash flow provided by operating activities | 219 | 206 | 180
Net cash flow used in investing activities | (101) | (144) | 30
Net cash flow used in financing activities | € (58) | € (80) | € (225)

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