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INTANGIBLE ASSETS AND GOODWILL - Narrative (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2024	Dec. 31, 2023	Dec. 31, 2024
Finite-Lived Intangible Assets [Line Items]
Goodwill		$ 41	$ 46
Goodwill, period increase (decrease)		0
Railtech Alu-Singen
Finite-Lived Intangible Assets [Line Items]
Goodwill, acquired during period	$ 5
P&ARP
Finite-Lived Intangible Assets [Line Items]
Goodwill		$ 28	$ 28

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