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Derivative Financial Instruments and Risk Management Policies - Breakdown of Financial Results (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of financial assets [line items]      
Total € 41,315 € 40,652 € 39,993
Financial expenses on lease liabilities (see Note 20) (504) (445)  
Subtotal (2,998) (3,014) (3,030)
Derivative instruments      
Disclosure of financial assets [line items]      
Interest income 486 516 384
Dividends received 39 29 25
Other financial income 326 349 894
Total 851 894 1,303
Changes in fair value of asset derivatives at fair value through profit or loss 145 114 377
Changes in fair value of liability derivatives at fair value through profit or loss (88) (42) (861)
Changes in the fair value of debt instruments and other assets at fair value to profit or loss 4 4 8
Transfer from equity of results of cash flow hedges - future cash flows that are no longer expected to happen 0 0 (2)
(Loss)/Gain on fair value hedges (226) 246 (1,818)
Gain/(loss) on adjustment to items hedged by fair value hedges 224 (292) 1,763
Subtotal 59 30 (533)
Interest expenses (1,796) (1,606) (1,548)
Financial expenses on lease liabilities (see Note 20) (512) (435) (393)
Ineffective portion of cash flow hedges (2) (12) (15)
Accretion of provisions and other liabilities (389) (489) 276
Other financial expenses (229) (297) (317)
Subtotal (2,928) (2,839) (1,997)
Net finance costs excluding foreign exchange differences and inflation adjustments € (2,018) € (1,915) € (1,227)