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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
Mar. 31, 2025
Mar. 31, 2024
Segment Reporting Information [Line Items]    
Segment Adjusted EBITDA $ 140 $ 160
Metal price lag 46 (14)
Depreciation and amortization (78) (75)
Impairment of assets 0 (3)
Share based compensation costs (6) (6)
Pension and other post-employment benefits - non - operating gains 3 3
Restructuring costs (1) 0
Unrealized losses on derivatives (12) (4)
Unrealized exchange (losses) / gains from the remeasurement of monetary assets and liabilities – net (1) 2
Losses on disposal 0 (1)
Other 3 0
Expenses on factoring arrangements (5) (5)
Finance costs - net (27) (27)
Income before tax 62 30
Income tax expense (24) (8)
Net income 38 22
Flooding of facilities, Valais, Switzerland    
Segment Reporting Information [Line Items]    
Insurance proceeds from catastrophes 7  
Loss from catastrophes 3  
A&T    
Segment Reporting Information [Line Items]    
Segment Adjusted EBITDA 75 87
P&ARP    
Segment Reporting Information [Line Items]    
Segment Adjusted EBITDA 60 48
AS&I    
Segment Reporting Information [Line Items]    
Segment Adjusted EBITDA 16 32
H&C    
Segment Reporting Information [Line Items]    
Segment Adjusted EBITDA $ (11) $ (7)