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Other current assets (Tables) | 12 Months Ended
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Dec. 31, 2017
Disclosure Of Other Current Assets [Abstract] |
Disclosure of detailed information about other current assets [text block] |
(€ million) |  | December 31, 2017 |  | December 31, 2016
Fair value of derivative financial instruments |  |  | 1,231 |  |  |  | 2,248 |
Other current assets |  |  | 342 |  |  |  | 343 |
|  |  | 1,573 |  |  |  | 2,591 |

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