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PROPERTY, PLANT AND EQUIPMENT - Depreciation Expense (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of detailed information about property, plant and equipment [line items]      
Depreciation expense and impairment losses € (259) € (256) € (197)
Cost of sales      
Disclosure of detailed information about property, plant and equipment [line items]      
Depreciation expense and impairment losses (240) (237) (184)
Selling and administrative expenses      
Disclosure of detailed information about property, plant and equipment [line items]      
Depreciation expense and impairment losses (14) (13) (9)
Research and development expenses      
Disclosure of detailed information about property, plant and equipment [line items]      
Depreciation expense and impairment losses € (5) € (6) € (4)