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REVENUE - Disclosure of revenue disaggregated by product line (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disaggregation of Revenue [Line Items]      
Total revenue by product line $ 7,335 $ 7,826 $ 8,532
Aerospace rolled products      
Disaggregation of Revenue [Line Items]      
Total revenue by product line 1,063 1,105 765
Transportation, industry, defense and other rolled products      
Disaggregation of Revenue [Line Items]      
Total revenue by product line 686 748 963
Packaging rolled products      
Disaggregation of Revenue [Line Items]      
Total revenue by product line 2,878 2,807 3,494
Automotive rolled products      
Disaggregation of Revenue [Line Items]      
Total revenue by product line 1,201 1,249 1,212
Specialty and other thin-rolled products      
Disaggregation of Revenue [Line Items]      
Total revenue by product line 104 137 184
Automotive extruded products      
Disaggregation of Revenue [Line Items]      
Total revenue by product line 960 1,126 997
Other extruded products      
Disaggregation of Revenue [Line Items]      
Total revenue by product line 443 633 917
Other      
Disaggregation of Revenue [Line Items]      
Total revenue by product line $ 0 $ 21 $ 0