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OTHER GAINS AND LOSSES - NET (Details) - USD ($)
$ in Millions
 12 Months Ended
Aug. 29, 2024
Sep. 29, 2023
Feb. 02, 2023
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Operating income and expenses            
Realized gains / (losses) on derivatives       $ 12 $ (50) $ (8)
Unrealized losses on derivatives at fair value though profit and loss - net       (1) (3) (48)
Unrealized exchange gains / (losses) from the remeasurement of monetary assets and liabilities – net       1 (2) (2)
Impairment of assets       (24) (22) (16)
Restructuring costs       (11) 0 (1)
(Losses) / gains on disposals       (4) 41 (5)
Results from the flood in Valais       2 0 0
Non-operating income and expenses            
Expenses on factoring arrangements       (22) (24) (16)
Pension and other post-employment benefits       11 14 2
Other       10 3 4
Total other gains and losses - net       (26) $ (43) $ (90)
Railtech Alu-Singen            
Non-operating income and expenses            
Fair value of assets acquired $ 3          
Flooding of facilities in Valais, Switzerland            
Non-operating income and expenses            
Insurance proceeds from catastrophes       45    
Loss from catastrophes       43    
Insurance proceeds from assets damaged       $ 4    
Disposal group, disposed of by sale, not discontinued operations | Constellium Ussel SAS            
Non-operating income and expenses            
Gain (loss) on disposals     $ (3)      
Disposal group, disposed of by sale, not discontinued operations | Constellium Extrusions Deutschland GmbH            
Non-operating income and expenses            
Gain (loss) on disposals   $ 47