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Related Parties - Narrative (Details) - EUR (€)
 12 Months Ended
Dec. 31, 2023
Sep. 11, 2023
Sep. 08, 2023
Oct. 07, 2022
Jul. 21, 2022
Jan. 05, 2021
Dec. 31, 2023
Dec. 31, 2022
Disclosure of transactions between related parties [line items]                
Unearned premiums € 5,565,729           € 5,565,729 € 6,598,467
Associates And Joint Ventures In Which Telefonica Renting, S.A                
Disclosure of transactions between related parties [line items]                
Services rendered             € 243,000,000  
BBVA                
Disclosure of transactions between related parties [line items]                
Significant shareholder stake of the Company (as a percent)             0.76% 0.73%
Services rendered             € 48,000,000 € 40,000,000
Guarantees             239,000,000 165,000,000
BBVA | Derivative instruments                
Disclosure of transactions between related parties [line items]                
Credit derivative, fair value 52,000,000           52,000,000 185,000,000
Nominal amount of hedging instrument 9,797,000,000           9,797,000,000 5,778,000,000
Guarantees             45,000,000 236,000,000
CaixaBank                
Disclosure of transactions between related parties [line items]                
Services rendered             79,000,000 69,000,000
Guarantees             104,000,000 160,000,000
Purchase of goods             63,000,000 53,000,000
Expense recognised during period for bad and doubtful debts for related party transaction             6,000,000 3,000,000
Outstanding commitments made by entity, related party transactions 142,000,000           142,000,000 119,000,000
Purchase of assets             117,000,000 82,000,000
Deposits maturity 2024 600,000,000           600,000,000  
CaixaBank | Derivative instruments                
Disclosure of transactions between related parties [line items]                
Credit derivative, fair value 27,000,000           27,000,000 41,000,000
Nominal amount of hedging instrument € 707,000,000           707,000,000 264,000,000
Guarantees             € 31,000,000 43,000,000
Banco Bilbao Vizcaya Argentaria And Caixabank | Derivative instruments                
Disclosure of transactions between related parties [line items]                
Credit derivatives, to total (in percentage) 13.00%           13.00%  
Telefónica Consumer Finance, Establecimiento Financiero de Crédito, S.A. Specialised credit institution                
Disclosure of transactions between related parties [line items]                
Proportion of voting rights held in subsidiary (as a percent)             50.00%  
Telefónica Factoring España, S.A. Factoring                
Disclosure of transactions between related parties [line items]                
Proportion of voting rights held in subsidiary (as a percent)             50.00%  
Telefonica Renting, S.A.                
Disclosure of transactions between related parties [line items]                
Proportion of voting rights held in subsidiary (as a percent)         50.00%      
Adquira España, S.A.                
Disclosure of transactions between related parties [line items]                
Proportion of ownership interest in joint venture (as a percent)             44.44%  
Movistar Fusion & Terminal | CaixaBank                
Disclosure of transactions between related parties [line items]                
Purchase of goods             € 393,000,000 405,000,000
Expense recognised during period for bad and doubtful debts for related party transaction             33,000,000 19,000,000
Outstanding commitments made by entity, related party transactions € 717,000,000           € 717,000,000 € 501,000,000
CaixaBank                
Disclosure of transactions between related parties [line items]                
Significant shareholder stake of the Company (as a percent)             3.51%  
BBVA                
Disclosure of transactions between related parties [line items]                
Significant shareholder stake of the Company (as a percent)             4.86%  
Proportion of ownership shares held             0.168%  
BBVA | Adquira España, S.A.                
Disclosure of transactions between related parties [line items]                
Proportion of ownership interest in joint venture (as a percent)             44.44%  
Telefonica Digital Espana | Movistar Consumer Finance Colombia SAS.                
Disclosure of transactions between related parties [line items]                
Proportion of voting rights held in joint venture           5000.00%    
Blackrock inc. | Telefónica, S.A.                
Disclosure of transactions between related parties [line items]                
Significant shareholder stake of the Company (as a percent) 4.50%     4.98%        
Proportion of voting rights held in subsidiary (as a percent)       4.51%        
Green Bridge Investment Company | Telefónica, S.A.                
Disclosure of transactions between related parties [line items]                
Significant shareholder stake of the Company (as a percent)     4.90%          
Conditional purchase and sale agreement, share percentage     5.00%          
Morgan Stanley | Telefónica, S.A.                
Disclosure of transactions between related parties [line items]                
Significant shareholder stake of the Company (as a percent)   0.007%            
Proportion of voting rights held in subsidiary (as a percent)   12.178%            
Proportion of voting rights held in subsidiary though financial instruments   12.171%            
Proportion of voting rights held in subsidiary though financial instruments, put/call option   9.90%