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Income taxes - Expiry years of net operating loss and credit carryforwards (Detail) - EUR (€)
€ in Millions
Dec. 31, 2020
Dec. 31, 2019
Income taxes [Line Items]    
Net operating loss carryforwards € 4,276 € 5,141
Net operating loss and tax credit carryforwards for which no deferred tax asset has been recognized 2,520 2,826
Not later than one year [member]    
Income taxes [Line Items]    
Net operating loss carryforwards 5 3
Net operating loss and tax credit carryforwards for which no deferred tax asset has been recognized 1 0
Later than one year and not later than two years [member]    
Income taxes [Line Items]    
Net operating loss carryforwards 1,546 6
Net operating loss and tax credit carryforwards for which no deferred tax asset has been recognized 1,541 3
Later than two years and not later than three years [member]    
Income taxes [Line Items]    
Net operating loss carryforwards 13 1,680
Net operating loss and tax credit carryforwards for which no deferred tax asset has been recognized 3 1,679
Later than three years and not later than four years [member]    
Income taxes [Line Items]    
Net operating loss carryforwards 235 14
Net operating loss and tax credit carryforwards for which no deferred tax asset has been recognized 0 7
Later than four years and not later than five years [member]    
Income taxes [Line Items]    
Net operating loss carryforwards 23 519
Net operating loss and tax credit carryforwards for which no deferred tax asset has been recognized 0 3
Later than five years [member]    
Income taxes [Line Items]    
Net operating loss carryforwards 1,026 1,173
Net operating loss and tax credit carryforwards for which no deferred tax asset has been recognized 24 12
Unlimited [Member]    
Income taxes [Line Items]    
Net operating loss carryforwards 1,428 1,746
Net operating loss and tax credit carryforwards for which no deferred tax asset has been recognized € 951 € 1,123