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Segment Information - Summary of Operating Results by Geographical Areas (Detail) - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of geographical areas [Line Items] |  |  |
Turnover | € 53,715 | € 52,713 | € 53,272
Non-current assets | 39,369 | 39,824 | 36,888
Country of Domicile [member] |  |  |
Disclosure of geographical areas [Line Items] |  |  |
Turnover | 3,849 | 3,819 | 4,157
Non-current assets | 3,781 | 4,770 | 4,878
United States [member] |  |  |
Disclosure of geographical areas [Line Items] |  |  |
Turnover | 8,532 | 8,263 | 7,956
Non-current assets | 11,820 | 11,696 | 9,674
Others [member] |  |  |
Disclosure of geographical areas [Line Items] |  |  |
Turnover | 41,334 | 40,631 | 41,159
Non-current assets | € 23,768 | € 23,358 | € 22,336

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