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Other financial assets - Text details (Detail) - EUR (€)
€ in Millions
6 Months Ended 12 Months Ended
Dec. 31, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Contractual obligations [Abstract]        
Contractual capital commitments € 83 € 83 € 90  
Current financial assets [Abstract]        
Current financial assets 2 2 101  
Changes in current financial assets   € (99)    
Combined Lumileds and Automotive Lighting businesses [Member] | Financial assets available-for-sale, category [Member]        
Available-for-sale financial assets [Abstract]        
Proportion of ownership interest in associate   19.10%    
Financial assets available-for-sale 243 € 243    
Value adjustment (49)      
TPV Technology Limited [Member]        
Current financial assets [Abstract]        
Current financial assets € 90 90 € 121
Changes in current financial assets   € (90)