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Income taxes - Components (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Components of the income tax (expense)/benefit      
Current tax € (295) € (367) € (530)
Deferred tax (2,961) 229 341
Total € (3,256) € (138) € (189)