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Income tax - Summary of Income Tax Expense (Benefit) (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Current tax expense      
Current year € 37 € 25 € 45
Changes in estimates in respect to prior year 2 (9) (1)
Total current tax expense 39 16 44
Deferred tax (benefit)/expense      
Temporary differences 5 (137) 27
Change in recognition of deferred tax 241 (7) (17)
Change in tax rates (1) 0 1
Changes in estimates in respect to prior years (1) 0 0
Total deferred tax expense/(benefit) 244 (144) 11
Income tax expense/(benefit) € 283 € (128) € 55