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Contingent assets and liabilities - Text Details (Detail) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2012
Dec. 05, 2012
Contingent assets and liabilities - Text Details (Detail) [Line Items]        
Fair value of guarantees recognized on the balance sheet      
Increase (decrease) of off-balance-sheet business and credit-related guarantees provided on behalf of third parties and associates € (3)      
Off-balance-sheet business and credit-related guarantees provided on behalf of third parties and associates € 40 € 44    
Cathode Ray Tubes (CRT) [Member]        
Contingent assets and liabilities - Text Details (Detail) [Line Items]        
Fine imposed       € 313
Company and LG Electronics Inc [Member]        
Contingent assets and liabilities - Text Details (Detail) [Line Items]        
Fine imposed       € 392
Legal proceedings contingent liability [member] | Company and LG Electronics Inc [Member]        
Contingent assets and liabilities - Text Details (Detail) [Line Items]        
Fine payable recognized     € 509