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Finance income (expense) (Tables) | 12 Months Ended
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Dec. 31, 2018
Disclosure Of Finance Income Expense Explanatory [Abstract] |
Disclosure Of Detailed Information About Finance Income expenses [Text Block] |
(€ million) |  | 2018 |  | 2017 |  | 2016
Finance income (expense) |  |  |  |  |  |  |  |  |  |  |  |
Finance income |  |  | 3,967 |  |  |  | 3,924 |  |  |  | 5,850 |
Finance expense |  |  | (4,663 | ) |  |  | (5,886 | ) |  |  | (6,232 | )
Net finance income (expense) from financial assets held for trading |  |  | 32 |  |  |  | (111 | ) |  |  | (21 | )
Income (expense) from derivative financial instruments |  |  | (307 | ) |  |  | 837 |  |  |  | (482 | )
|  |  | (971 | ) |  |  | (1,236 | ) |  |  | (885 | )
Disclosure Of Detailed Information About Type Of Net Finance Income Or Expense [Text Block] | The analysis of finance income (expense) was as follows:
(€ million) |  | 2018 |  | 2017 |  | 2016
Finance income (expense) related to net borrowings |  |  |  |  |  |  |  |  |  |  |  |
Interest and other finance expense on ordinary bonds |  |  | (565 | ) |  |  | (638 | ) |  |  | (639 | )
Net finance income (expense) on financial assets held for trading |  |  | 32 |  |  |  | (111 | ) |  |  | (21 | )
Interest due to banks and other financial institutions |  |  | (120 | ) |  |  | (113 | ) |  |  | (118 | )
I nterest and other income on financial receivables and securities held for non-operating purposes |  |  | 8 |  |  |  | 16 |  |  |  | 37 |
Interest from banks |  |  | 18 |  |  |  | 12 |  |  |  | 15 |
|  |  | (627 | ) |  |  | (834 | ) |  |  | (726 | )
Exchange differences |  |  | 341 |  |  |  | (905 | ) |  |  | 676 |
Income (expense) from derivative financial instruments |  |  | (307 | ) |  |  | 837 |  |  |  | (482 | )
Other finance income (expense) |  |  |  |  |  |  |  |  |  |  |  |
Interest and other income on financing receivables and securities held for operating purposes |  |  | 132 |  |  |  | 128 |  |  |  | 143 |
Capitalized finance expense |  |  | 52 |  |  |  | 73 |  |  |  | 106 |
Finance expense due to the passage of time (accretion discount) (a) |  |  | (249 | ) |  |  | (264 | ) |  |  | (312 | )
Other finance income (expense) |  |  | (313 | ) |  |  | (271 | ) |  |  | (290 | )
|  |  | (378 | ) |  |  | (334 | ) |  |  | (353 | )
|  |  | (971 | ) |  |  | (1,236 | ) |  |  | (885 | )
(a) The item related to the increase in provisions for contingencies that are shown at present value in non-current liabilities.

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