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Debt, Cash and Cash Equivalents - Summary of Market Value of Net Debt (Details) - EUR (€)
€ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2023
Dec. 31, 2022
Disclosure of detailed information about borrowings [Line Items]    
Market value € 19,140 € 19,218
Market value    
Disclosure of detailed information about borrowings [Line Items]    
Market value 10,105 5,227
Value on redemption    
Disclosure of detailed information about borrowings [Line Items]    
Market value 19,174 19,273
Value on redemption € 11,217 € 6,492