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Share Capital - Schedule of Share Capital (Detail) - EUR (€) € in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Disclosure of classes of share capital [line items] |  |
Beginning balance | 134,510,623 |
New shares issued | 1,488,771 |
Ending balance | 135,999,394 | 134,510,623
Beginning balance | € (319) | € (570)
New shares issued |  | 259
Ending balance | (114) | (319)
Share capital [member] |  |
Disclosure of classes of share capital [line items] |  |
Beginning balance | 3 | 2
New shares issued | 0 | 1
Ending balance | 3 | 3
Share premium [member] |  |
Disclosure of classes of share capital [line items] |  |
Beginning balance | 420 | 162
New shares issued | 0 | 258
Ending balance | € 420 | € 420

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