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Derivative Financial Instruments and Risk Management Policies - Breakdown of Financial Results (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of financial assets [line items]      
Total € 40,652 € 39,993 € 39,277
Subtotal 399 1,012  
Financial expenses on lease liabilities (see Note 20) (445) (365)  
Subtotal (3,014) (3,030) (2,028)
Increase (reduction) to finance income due to decisions with tax authorities   139 90
Telefonica de Argentina, SA      
Disclosure of financial assets [line items]      
Impact of hyperinflation on net monetary position on financial income 48 39 25
Derivative instruments      
Disclosure of financial assets [line items]      
Interest income 516 384 191
Dividends received 29 25 14
Other financial income 349 894 174
Total 894 1,303 379
Changes in fair value of asset derivatives at fair value through profit or loss 114 377 132
Changes in fair value of liability derivatives at fair value through profit or loss (42) (861) (24)
Changes in the fair value of debt instruments and other assets at fair value to profit or loss 4 8 0
Transfer from equity of results of cash flow hedges - future cash flows that are no longer expected to happen 0 (2) 0
(Loss)/Gain on fair value hedges 246 (1,818) (517)
Gain/(loss) on adjustment to items hedged by fair value hedges (292) 1,763 527
Subtotal 30 (533) 118
Interest expenses (1,606) (1,548) (1,290)
Financial expenses on lease liabilities (see Note 20) (435) (393) (274)
Ineffective portion of cash flow hedges (12) (15) (41)
Accretion of provisions and other liabilities (489) 276 (169)
Other financial expenses (297) (317) (137)
Subtotal (2,839) (1,997) (1,911)
Net finance costs excluding foreign exchange differences and hyperinflation adjustments (1,915) (1,227) € (1,414)
Derivative instruments | Spain      
Disclosure of financial assets [line items]      
Other financial income   € 526  
Derivative instruments | Telefónica Brazil      
Disclosure of financial assets [line items]      
Other financial income € 46