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Financial Risk Factors and Risk Management - Designated Hedged Items in Foreign Currency Exchange Rate Hedges (Details) - Foreign Currency - Cash Flow Risk - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
FINANCIAL RISK FACTORS    
Change in value used for calculating hedge ineffectiveness € (15) € 0
Cash flow hedge 0 0
Cost of hedging 0 0
Balances remaining in cash flow hedge reserve for which hedge accounting is no longer applied (15) 0
Forecasted License Payments    
FINANCIAL RISK FACTORS    
Change in value used for calculating hedge ineffectiveness 19 32
Cash flow hedge (19) (32)
Cost of hedging (7) (9)
Balances remaining in cash flow hedge reserve for which hedge accounting is no longer applied € 0 € 0