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Income taxes - Deferred income tax expense (Detail) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income taxes [Abstract]      
Changes to Recognition of Tax Loss and Credit Carry Forwards € 0 € 59 € (2)
Changes to Recognition of Temporary Differences 19 (32) 4
Adjustments for deferred tax of prior periods (8) (7) 15
Deferred tax expense (income) relating to tax rate changes or imposition of new taxes 13 2 (26)
Deferred tax expense (income) relating to origination and reversal of temporary differences 166 (35) 130
Deferred tax expense (income) recognised in profit or loss € 190 € (13) € 121