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FINANCIAL RISK MANAGEMENT - Narrative (Details)
SFr in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2020
EUR (€)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
EUR (€)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Jun. 30, 2019
CHF (SFr)
Dec. 31, 2018
EUR (€)
Dec. 31, 2017
EUR (€)
Disclosure of liquidity risk [line items]                
Percentage of trade account receivables insured 82.00%     82.00%        
Revolving credit facilities outstanding availability € 514,000,000              
Liquidity value 981,000,000              
Cash and cash equivalents 439,000,000   € 184,000,000       € 164,000,000 € 269,000,000
Undrawn facilities 542,000,000              
Forward contract                
Disclosure of liquidity risk [line items]                
Total nominal amount forward contracts | SFr           SFr 174    
Unrealized loss of the net investment hedge 3,000,000              
Derivative classified as cash flow hedge                
Disclosure of liquidity risk [line items]                
Nominal amount hedging instrument | $       $ 330 $ 233      
Forward purchase contracts versus EURO                
Disclosure of liquidity risk [line items]                
Net position hedges related to loans and deposits | $   $ 518            
Forward purchase contracts versus EURO | Foreign exchange forward contracts                
Disclosure of liquidity risk [line items]                
Net position hedges related to loans and deposits | $   47            
Forward purchase contracts versus EURO | Cross currency swaps                
Disclosure of liquidity risk [line items]                
Net position hedges related to loans and deposits | $   $ 565            
U.S. Revolving Facility                
Disclosure of liquidity risk [line items]                
Borrowing base | $       396        
French Inventory Based Facility                
Disclosure of liquidity risk [line items]                
Borrowing base | $       74        
German Facility                
Disclosure of liquidity risk [line items]                
Borrowing base | $       $ 50        
Currency risk                
Disclosure of liquidity risk [line items]                
Margin requirement paid as collateral to counterparties 3,000,000              
Commodity price risk                
Disclosure of liquidity risk [line items]                
Margin requirement for aluminum and other commodity hedges 0   0          
10% increase or decrease in the market price | Aluminium                
Disclosure of liquidity risk [line items]                
Impact of increase or decrease in market price in gain or loss from derivatives 27,000,000              
Top of range | 50 basis point increase or decrease in the LIBOR or EURIBOR interest rates                
Disclosure of liquidity risk [line items]                
Impact of increase or decrease in interest rate in income before income tax € 1,000,000   € 1,000,000