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Financial Assets and Liabilities - Breakdown of Financial Assets (Details) - EUR (€)
€ in Millions
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of financial assets [line items]      
Non-current financial assets € 8,167 € 9,765 € 10,405
Current financial assets 2,154 2,954  
Investments      
Disclosure of financial assets [line items]      
Non-current financial assets 650 825 1,289
Long-term credits      
Disclosure of financial assets [line items]      
Non-current financial assets 1,822 1,770 2,512
Deposits and guarantees      
Disclosure of financial assets [line items]      
Non-current financial assets 2,625 1,938 1,425
Current financial assets 125 450  
Derivative instruments      
Disclosure of financial assets [line items]      
Non-current financial assets 2,812 5,048 5,315
Current financial assets 845 1,872  
Impairment losses      
Disclosure of financial assets [line items]      
Non-current financial assets (138) (154) € (507)
Current financial assets 877 205  
Telefonica, S.A.      
Disclosure of financial assets [line items]      
Non-current financial assets 7,771 9,427  
Current financial assets 7,346 6,690  
Total 15,117 16,117  
Non-current financial assets, fair value 7,771 9,427  
Current financial assets, fair value 7,346 6,690  
Financial assets, fair value 15,117 16,117  
Telefonica, S.A. | Level 1 (Quoted prices)      
Disclosure of financial assets [line items]      
Non-current financial assets 822 864  
Current financial assets 105 483  
Total 927 1,347  
Telefonica, S.A. | Level 2 (Other directly observable market inputs)      
Disclosure of financial assets [line items]      
Non-current financial assets 3,339 5,766  
Current financial assets 915 1,806  
Total 4,254 7,572  
Telefonica, S.A. | Level 3 (Inputs not based on observable market data)      
Disclosure of financial assets [line items]      
Non-current financial assets 18 21  
Current financial assets 0 0  
Total 18 21  
Telefonica, S.A. | Fair value through profit or loss, Held for trading      
Disclosure of financial assets [line items]      
Non-current financial assets 1,074 1,716  
Current financial assets 163 883  
Total 1,237 2,599  
Telefonica, S.A. | Fair value through profit or loss, Fair value option      
Disclosure of financial assets [line items]      
Non-current financial assets 250 270  
Current financial assets 60 118  
Total 310 388  
Telefonica, S.A. | Available- for-sale      
Disclosure of financial assets [line items]      
Non-current financial assets 1,117 1,333  
Current financial assets 66 115  
Total 1,183 1,448  
Telefonica, S.A. | Hedges      
Disclosure of financial assets [line items]      
Non-current financial assets 1,738 3,332  
Current financial assets 731 1,173  
Total 2,469 4,505  
Telefonica, S.A. | Held-to-maturity invest-ments      
Disclosure of financial assets [line items]      
Non-current financial assets 0 0  
Current financial assets 169 39  
Total 169 39  
Telefonica, S.A. | Rest of financial assets at amortized cost      
Disclosure of financial assets [line items]      
Non-current financial assets 3,592 2,776  
Current financial assets 6,157 4,362  
Total 9,749 7,138  
Telefonica, S.A. | Investments      
Disclosure of financial assets [line items]      
Non-current financial assets 650 825  
Current financial assets 2,154 2,954  
Non-current financial assets, fair value 650 825  
Current financial assets, fair value 2,154 2,954  
Telefonica, S.A. | Investments | Level 1 (Quoted prices)      
Disclosure of financial assets [line items]      
Non-current financial assets 567 620  
Current financial assets 105 483  
Telefonica, S.A. | Investments | Level 2 (Other directly observable market inputs)      
Disclosure of financial assets [line items]      
Non-current financial assets 83 205  
Current financial assets 915 1,806  
Telefonica, S.A. | Investments | Level 3 (Inputs not based on observable market data)      
Disclosure of financial assets [line items]      
Non-current financial assets 0 0  
Current financial assets 0 0  
Telefonica, S.A. | Investments | Fair value through profit or loss, Held for trading      
Disclosure of financial assets [line items]      
Non-current financial assets 0 0  
Current financial assets 163 883  
Telefonica, S.A. | Investments | Fair value through profit or loss, Fair value option      
Disclosure of financial assets [line items]      
Non-current financial assets 0 0  
Current financial assets 60 118  
Telefonica, S.A. | Investments | Available- for-sale      
Disclosure of financial assets [line items]      
Non-current financial assets 650 825  
Current financial assets 66 115  
Telefonica, S.A. | Investments | Hedges      
Disclosure of financial assets [line items]      
Non-current financial assets 0 0  
Current financial assets 731 1,173  
Telefonica, S.A. | Investments | Held-to-maturity invest-ments      
Disclosure of financial assets [line items]      
Non-current financial assets 0 0  
Current financial assets 169 39  
Telefonica, S.A. | Investments | Rest of financial assets at amortized cost      
Disclosure of financial assets [line items]      
Non-current financial assets 0 0  
Current financial assets 965 626  
Telefonica, S.A. | Long-term credits      
Disclosure of financial assets [line items]      
Non-current financial assets 1,822 1,770  
Non-current financial assets, fair value 1,684 1,616  
Telefonica, S.A. | Long-term credits | Level 1 (Quoted prices)      
Disclosure of financial assets [line items]      
Non-current financial assets 86 76  
Telefonica, S.A. | Long-term credits | Level 2 (Other directly observable market inputs)      
Disclosure of financial assets [line items]      
Non-current financial assets 613 681  
Telefonica, S.A. | Long-term credits | Level 3 (Inputs not based on observable market data)      
Disclosure of financial assets [line items]      
Non-current financial assets 18 21  
Telefonica, S.A. | Long-term credits | Fair value through profit or loss, Held for trading      
Disclosure of financial assets [line items]      
Non-current financial assets 0 0  
Telefonica, S.A. | Long-term credits | Fair value through profit or loss, Fair value option      
Disclosure of financial assets [line items]      
Non-current financial assets 250 270  
Telefonica, S.A. | Long-term credits | Available- for-sale      
Disclosure of financial assets [line items]      
Non-current financial assets 467 508  
Telefonica, S.A. | Long-term credits | Hedges      
Disclosure of financial assets [line items]      
Non-current financial assets 0 0  
Telefonica, S.A. | Long-term credits | Held-to-maturity invest-ments      
Disclosure of financial assets [line items]      
Non-current financial assets 0 0  
Telefonica, S.A. | Long-term credits | Rest of financial assets at amortized cost      
Disclosure of financial assets [line items]      
Non-current financial assets 1,105 992  
Telefonica, S.A. | Deposits and guarantees      
Disclosure of financial assets [line items]      
Non-current financial assets 2,625 1,938  
Non-current financial assets, fair value 2,625 1,938  
Telefonica, S.A. | Deposits and guarantees | Level 1 (Quoted prices)      
Disclosure of financial assets [line items]      
Non-current financial assets 0 0  
Telefonica, S.A. | Deposits and guarantees | Level 2 (Other directly observable market inputs)      
Disclosure of financial assets [line items]      
Non-current financial assets 0 0  
Telefonica, S.A. | Deposits and guarantees | Level 3 (Inputs not based on observable market data)      
Disclosure of financial assets [line items]      
Non-current financial assets 0 0  
Telefonica, S.A. | Deposits and guarantees | Fair value through profit or loss, Held for trading      
Disclosure of financial assets [line items]      
Non-current financial assets 0 0  
Telefonica, S.A. | Deposits and guarantees | Fair value through profit or loss, Fair value option      
Disclosure of financial assets [line items]      
Non-current financial assets 0 0  
Telefonica, S.A. | Deposits and guarantees | Available- for-sale      
Disclosure of financial assets [line items]      
Non-current financial assets 0 0  
Telefonica, S.A. | Deposits and guarantees | Hedges      
Disclosure of financial assets [line items]      
Non-current financial assets 0 0  
Telefonica, S.A. | Deposits and guarantees | Held-to-maturity invest-ments      
Disclosure of financial assets [line items]      
Non-current financial assets 0 0  
Telefonica, S.A. | Deposits and guarantees | Rest of financial assets at amortized cost      
Disclosure of financial assets [line items]      
Non-current financial assets 2,625 1,938  
Telefonica, S.A. | Derivative instruments      
Disclosure of financial assets [line items]      
Non-current financial assets 2,812 5,048  
Non-current financial assets, fair value 2,812 5,048  
Telefonica, S.A. | Derivative instruments | Level 1 (Quoted prices)      
Disclosure of financial assets [line items]      
Non-current financial assets 169 168  
Telefonica, S.A. | Derivative instruments | Level 2 (Other directly observable market inputs)      
Disclosure of financial assets [line items]      
Non-current financial assets 2,643 4,880  
Telefonica, S.A. | Derivative instruments | Level 3 (Inputs not based on observable market data)      
Disclosure of financial assets [line items]      
Non-current financial assets 0 0  
Telefonica, S.A. | Derivative instruments | Fair value through profit or loss, Held for trading      
Disclosure of financial assets [line items]      
Non-current financial assets 1,074 1,716  
Telefonica, S.A. | Derivative instruments | Fair value through profit or loss, Fair value option      
Disclosure of financial assets [line items]      
Non-current financial assets 0 0  
Telefonica, S.A. | Derivative instruments | Available- for-sale      
Disclosure of financial assets [line items]      
Non-current financial assets 0 0  
Telefonica, S.A. | Derivative instruments | Hedges      
Disclosure of financial assets [line items]      
Non-current financial assets 1,738 3,332  
Telefonica, S.A. | Derivative instruments | Held-to-maturity invest-ments      
Disclosure of financial assets [line items]      
Non-current financial assets 0 0  
Telefonica, S.A. | Derivative instruments | Rest of financial assets at amortized cost      
Disclosure of financial assets [line items]      
Non-current financial assets 0 0  
Telefonica, S.A. | Impairment losses      
Disclosure of financial assets [line items]      
Non-current financial assets (138) (154)  
Non-current financial assets, fair value 0 0  
Telefonica, S.A. | Impairment losses | Level 1 (Quoted prices)      
Disclosure of financial assets [line items]      
Non-current financial assets 0 0  
Telefonica, S.A. | Impairment losses | Level 2 (Other directly observable market inputs)      
Disclosure of financial assets [line items]      
Non-current financial assets 0 0  
Telefonica, S.A. | Impairment losses | Level 3 (Inputs not based on observable market data)      
Disclosure of financial assets [line items]      
Non-current financial assets 0 0  
Telefonica, S.A. | Impairment losses | Fair value through profit or loss, Held for trading      
Disclosure of financial assets [line items]      
Non-current financial assets 0 0  
Telefonica, S.A. | Impairment losses | Fair value through profit or loss, Fair value option      
Disclosure of financial assets [line items]      
Non-current financial assets 0 0  
Telefonica, S.A. | Impairment losses | Available- for-sale      
Disclosure of financial assets [line items]      
Non-current financial assets 0 0  
Telefonica, S.A. | Impairment losses | Hedges      
Disclosure of financial assets [line items]      
Non-current financial assets 0 0  
Telefonica, S.A. | Impairment losses | Held-to-maturity invest-ments      
Disclosure of financial assets [line items]      
Non-current financial assets 0 0  
Telefonica, S.A. | Impairment losses | Rest of financial assets at amortized cost      
Disclosure of financial assets [line items]      
Non-current financial assets (138) (154)  
Telefonica, S.A. | Cash and cash equivalents      
Disclosure of financial assets [line items]      
Current financial assets 5,192 3,736  
Current financial assets, fair value 5,192 3,736  
Telefonica, S.A. | Cash and cash equivalents | Level 1 (Quoted prices)      
Disclosure of financial assets [line items]      
Current financial assets 0 0  
Telefonica, S.A. | Cash and cash equivalents | Level 2 (Other directly observable market inputs)      
Disclosure of financial assets [line items]      
Current financial assets 0 0  
Telefonica, S.A. | Cash and cash equivalents | Level 3 (Inputs not based on observable market data)      
Disclosure of financial assets [line items]      
Current financial assets 0 0  
Telefonica, S.A. | Cash and cash equivalents | Fair value through profit or loss, Held for trading      
Disclosure of financial assets [line items]      
Current financial assets 0 0  
Telefonica, S.A. | Cash and cash equivalents | Fair value through profit or loss, Fair value option      
Disclosure of financial assets [line items]      
Current financial assets 0 0  
Telefonica, S.A. | Cash and cash equivalents | Available- for-sale      
Disclosure of financial assets [line items]      
Current financial assets 0 0  
Telefonica, S.A. | Cash and cash equivalents | Hedges      
Disclosure of financial assets [line items]      
Current financial assets 0 0  
Telefonica, S.A. | Cash and cash equivalents | Held-to-maturity invest-ments      
Disclosure of financial assets [line items]      
Current financial assets 0 0  
Telefonica, S.A. | Cash and cash equivalents | Rest of financial assets at amortized cost      
Disclosure of financial assets [line items]      
Current financial assets € 5,192 € 3,736