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REVENUE - Disclosure of revenue disaggregated by product (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Disaggregation of Revenue [Line Items]
Total revenue	$ 2,166	$ 1,802	$ 6,248	$ 5,614
Aerospace rolled products
Disaggregation of Revenue [Line Items]
Total revenue	264	250	798	798
Transportation, industry, defense and other rolled products
Disaggregation of Revenue [Line Items]
Total revenue	199	154	567	550
Packaging rolled products
Disaggregation of Revenue [Line Items]
Total revenue	984	756	2,764	2,156
Automotive rolled products
Disaggregation of Revenue [Line Items]
Total revenue	297	305	883	936
Specialty and other thin-rolled products
Disaggregation of Revenue [Line Items]
Total revenue	23	25	73	85
Automotive extruded products
Disaggregation of Revenue [Line Items]
Total revenue	259	229	742	742
Other extruded products
Disaggregation of Revenue [Line Items]
Total revenue	$ 140	$ 83	$ 421	$ 347

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