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Debt, cash and cash equivalents and lease liabilities - Summary of Interest Rate Fluctuations of Debt Net of Cash and Cash Equivalents (Details) - Change in Euro and US dollar short-term interest rates
€ in Millions
 12 Months Ended
Dec. 31, 2024
EUR (€)
+100 bp  
Disclosure of Interest Rate of Debt Net of Cash and Cash Equivalent [Line Items]  
Impact on pre-tax net income € 34
Impact on pre-tax income/(expense) recognized directly in equity 0
+25 bp  
Disclosure of Interest Rate of Debt Net of Cash and Cash Equivalent [Line Items]  
Impact on pre-tax net income 8
Impact on pre-tax income/(expense) recognized directly in equity 0
-25 bp  
Disclosure of Interest Rate of Debt Net of Cash and Cash Equivalent [Line Items]  
Impact on pre-tax net income (8)
Impact on pre-tax income/(expense) recognized directly in equity 0
-100 bp  
Disclosure of Interest Rate of Debt Net of Cash and Cash Equivalent [Line Items]  
Impact on pre-tax net income (34)
Impact on pre-tax income/(expense) recognized directly in equity € 0