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Capital and Funding - Summary of Treasury Shares Movements (Detail) - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Disclosure of classes of share capital [Abstract] |  |
Treasury stock beginning balance | € (4,164) | € (4,119)
Repurchase of shares (see note 24) | (5,014) |
Other purchases and utilisations | (30) | (45)
Treasury stock ending balance | € (9,208) | € (4,164)

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