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Revenue - Contract backlog (Details) - EUR (€)
€ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Revenue      
Contract backlog as of the reported date € 1,557 € 780 € 409
Within one year      
Revenue      
Contract backlog as of the reported date 192 84 110
After one year      
Revenue      
Contract backlog as of the reported date € 1,365 € 696 € 299