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FINANCE COSTS—NET (Details) - EUR (€) € in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Analysis of income and expense [line items]
Interest expense on borrowings	€ (30)	€ (30)	€ (61)	€ (62)
Expenses on factoring arrangements	(3)	(5)	(6)	(10)
Interest expense on leases	(2)	(4)	(5)	(7)
Realized and unrealized (losses) / gains on debt derivatives at fair value	(7)	(4)	1	5
Realized and unrealized exchange (losses) / gains on financing activities - net	8	6	(3)	0
Interest cost on pension and other benefits	(3)	(4)	(6)	(8)
Other finance expenses	(6)	(2)	(8)	(8)
Capitalized borrowing costs	1	0	1	1
Finance expenses	(42)	(43)	(87)	(89)
Finance costs - net	€ (42)	€ (43)	€ (87)	€ (89)
Capitalization rate			6.00%	6.00%
Constellium SE Senior Notes
Analysis of income and expense [line items]
Interest expense on debt instruments issued			€ 57	€ 58
Pan US ABL Facility
Analysis of income and expense [line items]
Interest expense on debt instruments issued			€ 3	€ 3

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The weighted average of interest and other costs that an entity incurs in connection with the borrowing of funds applicable to the borrowings of the entity that are outstanding during the period, other than borrowings made specifically for the purpose of obtaining a qualifying asset. [Refer: Weighted average [member]; Borrowings]

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The gains (losses) resulting from change in the fair value of derivatives recognised in profit or loss. [Refer: Derivatives [member]]

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