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Income taxes - Text Details (Detail) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income taxes [Line Items]      
Tax expense (income), continuing operations [1] € 284 € 337 € 193
Tax expense relating to profit (loss) from ordinary activities of discontinued operations € 10 € 9 € 14
Applicable tax rate 25.00% 25.00% 25.00%
Net deferred tax assets € 1,761 € 1,721  
Deferred tax assets 1,820 1,865  
Deferred tax liabilities 59 143  
Deferred tax asset when utilisation is dependent on future taxable profits in excess of profits from reversal of taxable temporary differences and entity has suffered loss in jurisdiction to which deferred tax asset relates 35 239  
Temporary differences associated with investments in subsidiaries, branches and associates and interests in joint arrangements for which deferred tax liabilities have not been recognised 275 327  
Deductible temporary differences for which no deferred tax asset is recognised 33 31  
Other tax liability € 291 € 186  
[1] Non-IFRS financial measure. For the definition and reconciliation of the most directly comparable IFRS measure, refer to Reconciliation of non-IFRS information.