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CASH AND CASH EQUIVALENTS - Additional Information (Details) - EUR (€)
€ in Millions
Jun. 30, 2020
Dec. 31, 2019
Disclosure of cash and cash equivalents [line Items]    
Cash in bank and on hand € 378 € 184
Subsidiaries in capital control restrictions countries    
Disclosure of cash and cash equivalents [line Items]    
Cash in bank and on hand € 22 € 22