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Property Plant and Equipment - Independent Market Values of each Vessel (Details) € in Millions	12 Months Ended
	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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Number of vessels evaluated for impairment by the company.

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The amount by which a cash-generating unit's (group of units') recoverable amount exceeds its carrying amount. [Refer: Carrying amount [member]; Total for all cash-generating units [member]]

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