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Debt, cash and cash equivalents and lease liabilities - Summary of Debt by Currency (Details) - EUR (€)
€ in Millions
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure Of Debt By Currency [Line Items]      
Net debt € 6,437 € 9,983 € 8,790
Value on redemption before derivative instruments      
Disclosure Of Debt By Currency [Line Items]      
Net debt 6,585    
Value on redemption after derivative instruments      
Disclosure Of Debt By Currency [Line Items]      
Net debt 6,492 10,047 8,862
Euro | Value on redemption before derivative instruments      
Disclosure Of Debt By Currency [Line Items]      
Net debt 13,145    
Euro | Value on redemption after derivative instruments      
Disclosure Of Debt By Currency [Line Items]      
Net debt 10,489 13,129 13,725
US dollar | Value on redemption before derivative instruments      
Disclosure Of Debt By Currency [Line Items]      
Net debt (6,508)    
US dollar | Value on redemption after derivative instruments      
Disclosure Of Debt By Currency [Line Items]      
Net debt (2,404) (669) (3,304)
Singapore dollar | Value on redemption before derivative instruments      
Disclosure Of Debt By Currency [Line Items]      
Net debt 0    
Singapore dollar | Value on redemption after derivative instruments      
Disclosure Of Debt By Currency [Line Items]      
Net debt (2,155)    
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 359    
Mexican peso | Value on redemption before derivative instruments      
Disclosure Of Debt By Currency [Line Items]      
Net debt 0    
Mexican peso | Value on redemption after derivative instruments      
Disclosure Of Debt By Currency [Line Items]      
Net debt 98    
Other currencies | Value on redemption before derivative instruments      
Disclosure Of Debt By Currency [Line Items]      
Net debt (52)    
Other currencies | Value on redemption after derivative instruments      
Disclosure Of Debt By Currency [Line Items]      
Net debt € 105 € (2,413) € (1,559)