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Debt, cash and cash equivalents and lease liabilities - Summary of Debt by Currency (Details) - EUR (€)
€ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure Of Debt By Currency [Line Items]      
Net debt € 7,793 € 6,437 € 9,983
Value on redemption before derivative instruments      
Disclosure Of Debt By Currency [Line Items]      
Net debt 7,881    
Value on redemption after derivative instruments      
Disclosure Of Debt By Currency [Line Items]      
Net debt 7,835 6,492 10,047
Euro | Value on redemption before derivative instruments      
Disclosure Of Debt By Currency [Line Items]      
Net debt 10,113    
Euro | Value on redemption after derivative instruments      
Disclosure Of Debt By Currency [Line Items]      
Net debt 6,852 10,489 13,129
US dollar | Value on redemption before derivative instruments      
Disclosure Of Debt By Currency [Line Items]      
Net debt (2,376)    
US dollar | Value on redemption after derivative instruments      
Disclosure Of Debt By Currency [Line Items]      
Net debt 1,169 (2,404) (669)
Singapore dollar | Value on redemption before derivative instruments      
Disclosure Of Debt By Currency [Line Items]      
Net debt (3)    
Singapore dollar | Value on redemption after derivative instruments      
Disclosure Of Debt By Currency [Line Items]      
Net debt (1,143)    
Pound sterling | Value on redemption before derivative instruments      
Disclosure Of Debt By Currency [Line Items]      
Net debt 0    
Pound sterling | Value on redemption after derivative instruments      
Disclosure Of Debt By Currency [Line Items]      
Net debt 509    
Chinese yuan renminbi | Value on redemption before derivative instruments      
Disclosure Of Debt By Currency [Line Items]      
Net debt (19)    
Chinese yuan renminbi | Value on redemption after derivative instruments      
Disclosure Of Debt By Currency [Line Items]      
Net debt 189    
Other currencies | Value on redemption before derivative instruments      
Disclosure Of Debt By Currency [Line Items]      
Net debt 166    
Other currencies | Value on redemption after derivative instruments      
Disclosure Of Debt By Currency [Line Items]      
Net debt € 259 € (1,593) € (2,413)