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Deferred Income Taxes - Additional Information (Detail) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Major components of tax expense (income) [abstract]    
US tax rate decrease impact in P&L € (16)  
US tax rate decrease impact in OCI (8)  
Unused tax losses for which no deferred tax asset recognized 1,393 € 1,345
Related tax impact 356 € 428
Variance of unrecognized deferred tax assets 72  
Effect of US tax rate decrease on unrecognized deferred tax assets 93  
Effect of foreign exchange differrence on unrecognized deferred tax assets 35  
Increase of unrecognized deferred tax assets on deductible temporary differences and unused tax losses € (56)