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Combined Earnings Per Share - Summary of Computation of Earnings Per Share (Detail) - EUR (€) € / shares in Units, € in Millions, shares in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Earnings per share [Line Items] |  |  |
Basic earnings per share | € 2.16 | € 1.83 | € 1.73
Diluted earnings per share | 2.15 | 1.82 | 1.72
Underlying earnings per share | € 2.24 | € 2.03 | € 1.93
Less treasury shares held by employee share trusts and companies | (223.3) | (184.7) | (184.8)
Combined average number of share units | 2,801.6 | 2,840.2 | 2,840.1
Add dilutive effect of share-based compensation plans | 12.4 | 13.7 | 15.3
Diluted combined average number of share units - used for diluted and underlying earnings per share | 2,814.0 | 2,853.9 | 2,855.4
Net profit | € 6,486 | € 5,547 | € 5,259
Non-controlling interests | (433) | (363) | (350)
Net profit attributable to shareholders' equity - used for basic and diluted earnings per share | 6,053 | 5,184 | 4,909
Post tax impact of non-underlying items | 262 | 601 | 605
Underlying profit attributable to shareholders' equity - used for underlying earnings per share | € 6,315 | € 5,785 | € 5,514
Unilever N.V. [member] |  |  |
Earnings per share [Line Items] |  |  |
Combined average number of share units | 1,714.7 | 1,714.7 | 1,714.7
Unilever PLC [member] |  |  |
Earnings per share [Line Items] |  |  |
Combined average number of share units | 1,310.2 | 1,310.2 | 1,310.2

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