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Employees - Share-based Compensation Plans - Additional Information (Detail) - EUR (€)
€ in Millions
 2 Months Ended 12 Months Ended
Feb. 21, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of share based compensation plans [Line Items]      
Shares and options held in respect of share-based compensation plans   14,760,786 16,085,024
Number of ordinary shares held by NV group companies to satisfy options granted   15,802,464 16,936,797
Percentage of called up share capital, acquired during period   0.15%  
Percentage of called up share capital, held in connection with share plans   0.50% 0.60%
Book value of shares held in respect of share-based compensation plans eliminated on consolidation   € 695 € 727
Market value of shares held in respect of share-based compensation plans eliminated on consolidation   € 739 € 658
PLC option with exercise price above market price   0 0
Performance share plan : Number of shares granted between between 31/12/2017 and 21/02/2018 1,268,802    
Performance share plan : Number of shares vested between 31/12/2017 and 21/02/2018 5,293,709    
Performance share plan : Number of shares forfeited between 31/12/2017 and 21/02/2018 29,551    
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   60.00%  
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%