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Cash Flow Detail - Investing Activities, Proceeds and Payments on Financial Investments (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of associates [line items]      
Proceeds on financial investments not included under cash equivalents € 1,413 € 1,432 € 2,967
Payments on financial investments not included under cash equivalents (1,196) (1,475) (2,575)
Net proceeds/(payments) for temporary financial investments 50 856 1,532
Collateral guarantees on derivatives      
Disclosure of associates [line items]      
Proceeds on financial investments not included under cash equivalents 1,292 1,088 2,891
Payments on financial investments not included under cash equivalents (987) (1,402) (2,195)
Bond sales in Argentina      
Disclosure of associates [line items]      
Proceeds on financial investments not included under cash equivalents 91 9 0
Payments on financial investments not included under cash equivalents (170) (42) 0
Legal deposits      
Disclosure of associates [line items]      
Proceeds on financial investments not included under cash equivalents 12 31 3
Payments on financial investments not included under cash equivalents (10) (16) (4)
Long-term financial instruments of Pegaso PCS      
Disclosure of associates [line items]      
Proceeds on financial investments not included under cash equivalents 0 287 0
Payments on financial investments not included under cash equivalents 0 0 (260)
Others      
Disclosure of associates [line items]      
Proceeds on financial investments not included under cash equivalents 18 17 73
Payments on financial investments not included under cash equivalents € (29) € (15) € (116)