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BUSINESS AND SUMMARY OF ACCOUNTING POLICIES - Revision of Certain Footnote Disclosures in Previously Issued Financial Statements (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Sep. 30, 2024
Jun. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Error Corrections and Prior Period Adjustments Restatement [Line Items]                
Segment Adjusted EBITDA $ 196 $ 165 $ 147 $ 131 $ 184 $ 507 $ 476 $ 575
Metal price lag 39 (19) 39 (5) 41 59 22 48
As published                
Error Corrections and Prior Period Adjustments Restatement [Line Items]                
Segment Adjusted EBITDA   159 140   180     568
Metal price lag   (13) 46   45     55
Adjustment                
Error Corrections and Prior Period Adjustments Restatement [Line Items]                
Segment Adjusted EBITDA   6 7   4     7
Metal price lag   (6) (7)   (4)     (7)
A&T                
Error Corrections and Prior Period Adjustments Restatement [Line Items]                
Segment Adjusted EBITDA 90 84 82 54 94 256 235 292
A&T | As published                
Error Corrections and Prior Period Adjustments Restatement [Line Items]                
Segment Adjusted EBITDA   78 75   90     285
A&T | Adjustment                
Error Corrections and Prior Period Adjustments Restatement [Line Items]                
Segment Adjusted EBITDA   6 7   4     7
P&ARP                
Error Corrections and Prior Period Adjustments Restatement [Line Items]                
Segment Adjusted EBITDA 82 74 60 72 66 217 186 242
P&ARP | As published                
Error Corrections and Prior Period Adjustments Restatement [Line Items]                
Segment Adjusted EBITDA   74 60   66     242
AS&I                
Error Corrections and Prior Period Adjustments Restatement [Line Items]                
Segment Adjusted EBITDA 33 18 16 7 30 67 70 74
AS&I | As published                
Error Corrections and Prior Period Adjustments Restatement [Line Items]                
Segment Adjusted EBITDA   18 16   30     74
H&C                
Error Corrections and Prior Period Adjustments Restatement [Line Items]                
Segment Adjusted EBITDA $ (9) (12) (11) $ (2) (6) $ (32) $ (15) (33)
H&C | As published                
Error Corrections and Prior Period Adjustments Restatement [Line Items]                
Segment Adjusted EBITDA   $ (12) $ (11)   $ (6)     $ (33)