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Derivative Financial Instruments and Risk Management Policies - Evolution of Derivative Instruments (Details) - Derivative instruments - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Derivative Assets/ Liabilities, Net [Roll Forward]    
Opening balance of assets/(liabilities) € 399 € 1,012
Financing payments 20 (33)
Financing proceeds (385) (20)
Interest (proceeds)/payments (50) 97
Other (proceeds)/payments 123 87
Fair value adjustments through other comprehensive income 1,108 (584)
Movements with a corresponding entry under the income statement (253) (57)
Translation differences 40 (115)
Other movements 0 12
Closing balance of assets/(liabilities) € 1,002 € 399