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Revenue and Expenses - Other Expenses (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of transactions between related parties [line items]      
Leases € 1,069 € 1,076 € 1,163
Advertising 1,211 1,256 1,367
Other external services 10,445 10,436 11,586
Taxes other than income tax 1,285 1,136 1,232
Change in trade provisions 863 799 831
Losses on disposal of fixed assets and changes in provisions for fixed assets 44 71 39
Goodwill impairment (Note 7) 0 215 104
Other operating expenses 509 352 480
Total € 15,426 € 15,341 16,802
Fundación Telefónica      
Disclosure of transactions between related parties [line items]      
Outstanding commitments made by entity, related party transactions     € 325