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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% |

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