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Income taxes - Expiry years of net operating loss and credit carryforwards (Detail) - EUR (€)
€ in Millions
Dec. 31, 2023
Dec. 31, 2022
Income taxes [Line Items]    
Net operating loss carryforwards € 3,896 € 3,187
Net operating loss and tax credit carryforwards for which no deferred tax asset has been recognized 1,366 1,032
Not later than one year [member]    
Income taxes [Line Items]    
Net operating loss carryforwards 17 4
Net operating loss and tax credit carryforwards for which no deferred tax asset has been recognized 15 3
Later than one year and not later than two years [member]    
Income taxes [Line Items]    
Net operating loss carryforwards 20 10
Net operating loss and tax credit carryforwards for which no deferred tax asset has been recognized 16 5
Later than two years and not later than three years [member]    
Income taxes [Line Items]    
Net operating loss carryforwards 7 9
Net operating loss and tax credit carryforwards for which no deferred tax asset has been recognized 2 3
Later than three years and not later than four years [member]    
Income taxes [Line Items]    
Net operating loss carryforwards 9 13
Net operating loss and tax credit carryforwards for which no deferred tax asset has been recognized 5 4
Later than four years and not later than five years [member]    
Income taxes [Line Items]    
Net operating loss carryforwards 38 38
Net operating loss and tax credit carryforwards for which no deferred tax asset has been recognized 16 3
Later than five years [member]    
Income taxes [Line Items]    
Net operating loss carryforwards 808 812
Net operating loss and tax credit carryforwards for which no deferred tax asset has been recognized 81 93
Unlimited [Member]    
Income taxes [Line Items]    
Net operating loss carryforwards 2,997 2,301
Net operating loss and tax credit carryforwards for which no deferred tax asset has been recognized € 1,231 € 920