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INCOME TAX - Current and Deferred Components of Income Tax (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Taxes [Abstract]      
Current tax expense € (32) € (30) € (26)
Deferred tax expense 14 (2) (54)
Total income tax expense € (18) € (32) € (80)