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Revenues (Details 1) - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure Of Revenue Explanatory [Abstract] |  |  |
Excise taxes | € 11,378 | € 11,913 | € 11,889
Services recharged to joint venture partners | 4,702 | 4,441 | 5,609
Sales to service station managers for sales billed to holders of credit cards | 1,675 | 1,553 | 1,643
Exchanges of oil sales (excluding excise taxes) | 994 | 878 | 1,154
Cost of sales | € 18,749 | € 18,785 | € 20,295

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