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Employees - Share- based Compensation Plans - Additional Information (Detail) - EUR (€)
€ in Millions
 2 Months Ended 12 Months Ended
Feb. 21, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of Share Based Compensation Plans [Line Items]      
Shares and options outstanding in respect of share-based compensation plans   14,595,111 14,760,786
Number of ordinary shares held by NV group companies to satisfy options granted   15,010,429 15,802,464
Shares acquired to called up share capital, percentage   0.21%  
Percentage of called up share capital, held in connection with share plans   0.50% 0.50%
Book value of shares held in respect of share-based compensation plans eliminated on consolidation   € 704 € 695
Market value of shares held in respect of share-based compensation plans eliminated on consolidation   € 700 € 739
PLC option with exercise price above market price   0 0
Performance share plan : Number of shares granted between between 31/12/2018 and 21/02/2019 0    
Performance share plan : Number of shares vested between 31/12/2018 and 21/02/2019 5,534,564    
Performance share plan : Number of shares forfeited between 31/12/2018 and 21/02/2019 92,699    
Executive Directors [Member]      
Disclosure of Share Based Compensation Plans [Line Items]      
Maximum percentage of annual bonus that managers are entitled to invest in shares under MCIP   67.00%  
Other Managers [Member]      
Disclosure of Share Based Compensation Plans [Line Items]      
Maximum percentage of annual bonus that managers are entitled to invest in shares under MCIP   100.00%  
Bottom of range [member]      
Disclosure of Share Based Compensation Plans [Line Items]      
Range of share awards percentage for performance share plans   0.00%  
Top of range [member]      
Disclosure of Share Based Compensation Plans [Line Items]      
Range of share awards percentage for performance share plans   200.00%