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Deferred Income Taxes - Components of Non Recognized Deferred Tax Assets (Detail) - EUR (€)
€ in Millions
Dec. 31, 2017
Dec. 31, 2016
Significant components of deferred tax assets and liabilities [line items]    
Tax losses € 1,393 € 1,345
Total (356) (428)
Unused tax losses [member]    
Significant components of deferred tax assets and liabilities [line items]    
Tax losses (183) (164)
Long-term assets [member]    
Significant components of deferred tax assets and liabilities [line items]    
Deductible temporary differences (116) (193)
Pensions [member]    
Significant components of deferred tax assets and liabilities [line items]    
Deductible temporary differences (20) (25)
Other temporary differences [member]    
Significant components of deferred tax assets and liabilities [line items]    
Deductible temporary differences (37) (46)
Temporary differences [member]    
Significant components of deferred tax assets and liabilities [line items]    
Deductible temporary differences (173) (264)
Expiring in 2018 to 2021 [member] | Unused tax losses [member]    
Significant components of deferred tax assets and liabilities [line items]    
Tax losses (22) (13)
Expiring in 2022 and after limited [member] | Unused tax losses [member]    
Significant components of deferred tax assets and liabilities [line items]    
Tax losses (143) (132)
Unlimited [member] | Unused tax losses [member]    
Significant components of deferred tax assets and liabilities [line items]    
Tax losses € (18) € (19)