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Revenue - Contract backlog (Details) - EUR (€)
€ in Millions
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Revenue      
Contract backlog as of the reported date € 2,336 € 1,735 € 905
Firm      
Revenue      
Contract backlog as of the reported date 1,906 1,377 655
Subject to exercise of counterparty options (non-contingent)      
Revenue      
Contract backlog as of the reported date 215 179 125
Subject to exercise of counterparty options (contingent)      
Revenue      
Contract backlog as of the reported date 215 179 125
Within 1 year      
Revenue      
Contract backlog as of the reported date 428 208 85
Within 1 year | Firm      
Revenue      
Contract backlog as of the reported date 372 176 81
Within 1 year | Subject to exercise of counterparty options (non-contingent)      
Revenue      
Contract backlog as of the reported date 28 16 2
Within 1 year | Subject to exercise of counterparty options (contingent)      
Revenue      
Contract backlog as of the reported date 28 16 2
After 1 year      
Revenue      
Contract backlog as of the reported date 1,908 1,527 820
After 1 year | Firm      
Revenue      
Contract backlog as of the reported date 1,534 1,201 574
After 1 year | Subject to exercise of counterparty options (non-contingent)      
Revenue      
Contract backlog as of the reported date 187 163 123
After 1 year | Subject to exercise of counterparty options (contingent)      
Revenue      
Contract backlog as of the reported date € 187 € 163 € 123