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Revenue and Expenses - Other Expenses (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of transactions between related parties [line items]      
Leases included in Other expenses € 86 € 80 € 89
Other external services 8,731 8,604 9,617
Taxes other than income tax 834 703 902
Change in trade provisions 693 660 860
Losses on disposal of fixed assets and changes in provisions for fixed assets 124 51 416
Goodwill impairment (Note 7) 0 416 519
Other operating expenses 273 462 468
Total 10,741 10,976 12,871
Reduction to tax expense due to decisions with tax authorities 73 € 261 75
Telefónica Argentina      
Disclosure of transactions between related parties [line items]      
Losses on disposal of fixed assets and changes in provisions for fixed assets € 77   € 375