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Financial Risk Factors and Risk Management - Designated Hedging Instruments in Interest Rate Hedges (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Carrying amount    
Other financial assets € 8,887 € 6,479
Interest Rate Hedges | Interest Rate Risk | Interest Rate Swaps for EUR    
FINANCIAL RISK FACTORS    
Notional amount 4,550 4,550
Carrying amount    
Other financial assets 0 0
Other financial liabilities (535) (749)
Change in fair value used for measuring ineffectiveness for the reporting period (214) 700
Interest Rate Hedges | Interest Rate Risk | Interest Rate Swaps for USD    
FINANCIAL RISK FACTORS    
Notional amount 90 94
Carrying amount    
Other financial assets 0 0
Other financial liabilities (1) (3)
Change in fair value used for measuring ineffectiveness for the reporting period € (2) € 10