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Equity - Dividends (Details) - EUR (€)
€ / shares in Units, € in Millions
12 Months Ended
Dec. 14, 2017
Jun. 16, 2017
Jun. 09, 2017
Nov. 11, 2016
May 12, 2016
Dec. 07, 2015
Nov. 13, 2015
Apr. 29, 2015
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Sep. 25, 2017
Sep. 20, 2017
Dec. 07, 2016
Disclosure of classes of share capital [line items]                            
Cash dividends impact on equity                 € 2,602 € 2,930 € 2,890      
Percentage of free-of-charge allotment rights       70.01%     79.99%              
Legal reserve                 51          
Profit for the year                 € 3,378 € 2,399 751      
Ordinary shares                            
Disclosure of classes of share capital [line items]                            
Dividends paid (in eur per share) € 0.20 € 0.20 € 0.40   € 0.40     € 0.40            
Dividends paid, total amount € 1,025 € 994     € 1,906     € 1,912            
Assignment dividends paid (in eur per share)       € 0.35                    
Par value per share (EUR per share)       € 1     € 1   € 1 € 1       € 1
Number of shares issued       137,233,781     110,857,946         154,341,669 154,326,696 137,233,781
Irrevocable purchase commitment                            
Disclosure of classes of share capital [line items]                            
Percentage of free-of-charge allotment rights             20.01%              
Non-controlling interests                            
Disclosure of classes of share capital [line items]                            
Cash dividends impact on equity                 € 583 € 524 641      
Profit for the year                 246 € 30 € 135      
Non-controlling interests | Ordinary shares                            
Disclosure of classes of share capital [line items]                            
Cash dividends impact on equity       € 500   € 337                
Telefonica, S.A.                            
Disclosure of classes of share capital [line items]                            
Legal reserve                 51          
Other reserves                 503          
Profit for the year                 € 554