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FINANCIAL RISK MANAGEMENT - Additional Information (Details)
€ in Millions, SFr in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2019
EUR (€)
Jun. 30, 2020
EUR (€)
Jun. 30, 2020
USD ($)
Dec. 31, 2019
USD ($)
Jun. 30, 2019
EUR (€)
Jun. 30, 2019
CHF (SFr)
Dec. 31, 2018
EUR (€)
Disclosure of liquidity risk [line items]              
Revolving credit facilities outstanding € 281 € 506          
Liquidity value 516 949          
Cash and cash equivalents 184 378     € 213   € 164
Undrawn facilities 332 571          
Secured Pan-U.S. ABL (due 2022)              
Disclosure of liquidity risk [line items]              
Borrowing base | $     $ 322 $ 375      
Secured U.S. DDTL (due 2022)              
Disclosure of liquidity risk [line items]              
Borrowing base | $     166        
French inventory facility              
Disclosure of liquidity risk [line items]              
Borrowing base 82 € 78          
Forward contract              
Disclosure of liquidity risk [line items]              
Total nominal amount forward contracts | SFr           SFr 174  
Unrealized loss of the net investment hedge € 3            
Derivative classified as cash flow hedge              
Disclosure of liquidity risk [line items]              
Nominal amount hedging instrument | $     109 $ 233      
Derivative classified as cash flow hedge | Foreign exchange forward contracts              
Disclosure of liquidity risk [line items]              
Nominal amount hedging instrument | $     $ 255