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Income tax - Summary of Income Tax Expense (Benefit) (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Current tax expense      
Current year € 25 € 45 € 41
Changes in estimates in respect to prior year (9) (1) 0
Total current tax expense 16 44 41
Deferred tax (benefit)/expense      
Temporary differences (137) 27 (123)
Change in recognition of deferred tax (7) (17) (14)
Change in tax rates 0 1 1
Total deferred tax expense/(benefit) (144) 11 (136)
Income tax (benefit)/expense € (128) € 55 € (95)