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Property, plant and equipment - Summary of Off Balance Sheet Commitments Relating to Property, Plant and Equipment (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Property, plant and equipment [abstract]      
Firm orders of property, plant and equipment € 638 € 861 € 769
Property, plant and equipment pledged as security for liabilities € 16 € 0 € 9