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Finance Leases - Lessee (Details)
€ in Millions
Dec. 31, 2017
EUR (€)
Sep. 27, 2017
Aug. 29, 2017
EUR (€)
Aug. 29, 2017
COP
Telefónica Brazil        
Disclosure of finance lease and operating lease by lessee [line items]        
Present value € 98      
Revaluation 101      
Pending payment 199      
Net assets under finance lease agreements 71      
Telefónica Brazil | Within one year        
Disclosure of finance lease and operating lease by lessee [line items]        
Present value 13      
Revaluation 2      
Pending payment 15      
Telefónica Brazil | From one to five years        
Disclosure of finance lease and operating lease by lessee [line items]        
Present value 37      
Revaluation 14      
Pending payment 51      
Telefónica Brazil | More than 5 years        
Disclosure of finance lease and operating lease by lessee [line items]        
Present value 48      
Revaluation 85      
Pending payment 133      
Telefónica Spain        
Disclosure of finance lease and operating lease by lessee [line items]        
Present value 111      
Revaluation 4      
Pending payment 115      
Telefónica Spain | Within one year        
Disclosure of finance lease and operating lease by lessee [line items]        
Present value 79      
Revaluation 3      
Pending payment 82      
Telefónica Spain | From one to five years        
Disclosure of finance lease and operating lease by lessee [line items]        
Present value 32      
Revaluation 1      
Pending payment 33      
Telefónica Germany        
Disclosure of finance lease and operating lease by lessee [line items]        
Present value 33      
Revaluation 1      
Pending payment 34      
Net assets under finance lease agreements 124      
Telefónica Germany | Within one year        
Disclosure of finance lease and operating lease by lessee [line items]        
Present value 18      
Revaluation 1      
Pending payment 19      
Telefónica Germany | From one to five years        
Disclosure of finance lease and operating lease by lessee [line items]        
Present value 15      
Revaluation 0      
Pending payment 15      
Colombia Telecomunicaciones, S.A., ESP        
Disclosure of finance lease and operating lease by lessee [line items]        
Percentage of payment obligations assumed by government   32.50%    
Present value 1,275   € 1,236 COP 4,290,992
Revaluation 1,167      
Pending payment 2,442      
Colombia Telecomunicaciones, S.A., ESP | Within one year        
Disclosure of finance lease and operating lease by lessee [line items]        
Present value 152      
Revaluation 9      
Pending payment 161      
Colombia Telecomunicaciones, S.A., ESP | From one to five years        
Disclosure of finance lease and operating lease by lessee [line items]        
Present value 517      
Revaluation 207      
Pending payment 724      
Colombia Telecomunicaciones, S.A., ESP | More than 5 years        
Disclosure of finance lease and operating lease by lessee [line items]        
Present value 606      
Revaluation 951      
Pending payment € 1,557