v3.26.3
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
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Segment Reporting [Line Items]        
Segment Adjusted EBITDA $ 280 $ 196 $ 852 $ 507
Metal price lag (4) 39 222 59
Depreciation and amortization (82) (84) (249) (244)
Impairment of assets 0 0 (3) 0
Share based compensation (8) (7) (27) (20)
Pension and other post-employment benefits - non-operating gains 3 3 10 10
Restructuring costs 0 (1) (5) (3)
Unrealized (losses) / gains on derivatives 5 13 (55) 34
Unrealized exchange gains / (losses) from the remeasurement of monetary assets and liabilities – net 0 1 1 1
Losses on disposal 0 0 (1) (1)
Other (1) (2) (1) 0
Expenses on factoring arrangements (6) (5) (15) (16)
Finance costs - net (27) (27) (83) (83)
Income before tax 160 126 646 244
Income tax expense (41) (38) (183) (82)
Net income 119 88 463 162
Flooding of facilities, Valais, Switzerland        
Segment Reporting [Line Items]        
Insurance proceeds from catastrophes       9
Loss from catastrophes       8
A&T        
Segment Reporting [Line Items]        
Segment Adjusted EBITDA 102 90 340 256
P&ARP        
Segment Reporting [Line Items]        
Segment Adjusted EBITDA 162 82 478 217
AS&I        
Segment Reporting [Line Items]        
Segment Adjusted EBITDA 21 33 71 67
H&C        
Segment Reporting [Line Items]        
Segment Adjusted EBITDA $ (5) $ (9) $ (37) $ (32)