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INCOME TAX - Current and Deferred Components of Income Tax (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Taxes [Abstract]      
Current tax expense € (14) € (32) € (30)
Deferred tax benefit / (expense) 31 14 (2)
Total income tax benefit / (expense) € 17 € (18) € (32)