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Deferred Income Taxes - Components of Non Recognized Deferred Tax Assets (Detail) - EUR (€)
€ in Millions
Dec. 31, 2018
Dec. 31, 2017
Significant components of deferred tax assets and liabilities [line items]    
Tax losses € 1,257 € 1,393
Total (321) (356)
Unused tax losses [member]    
Significant components of deferred tax assets and liabilities [line items]    
Tax losses (153) (183)
Long-term assets [member]    
Significant components of deferred tax assets and liabilities [line items]    
Deductible temporary differences (107) (116)
Pensions [member]    
Significant components of deferred tax assets and liabilities [line items]    
Deductible temporary differences (18) (20)
Other temporary differences [member]    
Significant components of deferred tax assets and liabilities [line items]    
Deductible temporary differences (43) (37)
Temporary differences [member]    
Significant components of deferred tax assets and liabilities [line items]    
Deductible temporary differences (168) (173)
Expiring within 5 years [member] | Unused tax losses [member]    
Significant components of deferred tax assets and liabilities [line items]    
Tax losses (45) (69)
Expiring after 5 years and limited [member] | Unused tax losses [member]    
Significant components of deferred tax assets and liabilities [line items]    
Tax losses (89) (96)
Unlimited [member] | Unused tax losses [member]    
Significant components of deferred tax assets and liabilities [line items]    
Tax losses € (19) € (18)