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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% |

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