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Property Plant and Equipment - Independent Market Values of each Vessel (Details) € in Millions | 12 Months Ended
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Dec. 31, 2024 EUR (€) item | Dec. 31, 2023 EUR (€) | Dec. 31, 2022 EUR (€)
Property, Plant and Equipment |  |  |
Number of vessels evaluated for impairment | item | 2 |  |
WTGFIV |  |  |
Property, Plant and Equipment |  |  |
Broker Valuation For Calculation of Impairment | € 1,103 | € 574 | € 380
Amount by which unit's recoverable amount exceeds its carrying amount | € 227 | € 58 | € 160
Number of vessels evaluated for impairment | 4 | 3 | 2
O&MV |  |  |
Property, Plant and Equipment |  |  |
Broker Valuation For Calculation of Impairment | € 89 | € 95 |
Amount by which unit's recoverable amount exceeds its carrying amount | € 1 |  |
Number of vessels evaluated for impairment | 1 | 1 |

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