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REVENUE - Disclosure of revenue disaggregated by product line (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Disaggregation of Revenue [Line Items]    
Total revenue by product line $ 1,979 $ 1,880
Aerospace rolled products    
Disaggregation of Revenue [Line Items]    
Total revenue by product line 267 286
Transportation, industry, defense and other rolled products    
Disaggregation of Revenue [Line Items]    
Total revenue by product line 168 184
Packaging rolled products    
Disaggregation of Revenue [Line Items]    
Total revenue by product line 868 671
Automotive rolled products    
Disaggregation of Revenue [Line Items]    
Total revenue by product line 291 311
Specialty and other thin-rolled products    
Disaggregation of Revenue [Line Items]    
Total revenue by product line 24 32
Automotive extruded products    
Disaggregation of Revenue [Line Items]    
Total revenue by product line 234 263
Other extruded products    
Disaggregation of Revenue [Line Items]    
Total revenue by product line $ 127 $ 133