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Financial Risk Factors and Risk Management - Interest Rate Benchmark Reform and Cash Flow Hedges (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Financial Risk Factors and Risk Management    
Maximum derivative financial instruments hedge horizon and maturity 12 months  
The timeframe of occurrence of hedged forecasted transactions and recognition in profit or loss 12 months  
Non-derivative financial debt investments € 3,695 € 1,122