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SEGMENT INFORMATION - Schedule of Segment Adjusted EBITDA and reconciliation of Adjusted EBITDA to Net Income (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
Segment Reporting Information [Line Items]                
Segment Adjusted EBITDA $ 196 $ 165 $ 147 $ 131 $ 184 $ 507 $ 476 $ 575
Metal price lag 39 (19) 39 (5) 41 59 22 48
Depreciation and amortization (84)     (76)   (244) (227)  
Impairment of assets 0     (5)   0 (13)  
Share based compensation costs (7)     (5)   (20) (18)  
Pension and other post-employment benefits - non - operating gains 3     3   10 10  
Restructuring costs (1)     (4)   (3) (7)  
Unrealized gains on derivatives 13     19   34 19  
Unrealized exchange gains / (losses) from the remeasurement of monetary assets and liabilities – net 1     (1)   1 1  
Losses on disposal 0     (2)   (1) (3)  
Other (2)     0   0 (8)  
Expenses on factoring arrangements (5)     (6)   (16) (16)  
Finance costs - net (27)     (31)   (83) (83)  
Income before tax 126     19   244 153  
Income tax expense (38)     (11)   (82) (46)  
Net income 88     8   162 107  
Other costs related to transformation projects             4  
Railtech Alu-Singen                
Segment Reporting Information [Line Items]                
Fair value of assets acquired             2  
Flooding of facilities, Valais, Switzerland                
Segment Reporting Information [Line Items]                
Insurance proceeds from catastrophes       22   9 22  
Loss from catastrophes           8    
Inventory write-down             6  
A&T                
Segment Reporting Information [Line Items]                
Segment Adjusted EBITDA 90 84 82 54 94 256 235 292
P&ARP                
Segment Reporting Information [Line Items]                
Segment Adjusted EBITDA 82 74 60 72 66 217 186 242
AS&I                
Segment Reporting Information [Line Items]                
Segment Adjusted EBITDA 33 18 16 7 30 67 70 74
H&C                
Segment Reporting Information [Line Items]                
Segment Adjusted EBITDA $ (9) $ (12) $ (11) $ (2) $ (6) $ (32) $ (15) $ (33)