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Information on net borrowings (Tables) | 12 Months Ended
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Dec. 31, 2018
Disclosure of Information on net borrowings [Abstract] |
Disclosure of detailed information of net borrowings [Text Block] | Management believes that net borrowings is a useful measure of Eni’s financial condition as it provides insight about the soundness of Eni’s capital structure and the ways by which Eni’s operating assets are financed.
|  | December 31, 2018 |  |  | December 31, 2017 |
(€ million) |  | Current |  |  | Non-current |  |  | Total |  |  | Current |  |  | Non-current |  |  | Total |
A. Cash and cash equivalents |  |  | 10,836 |  |  |  |  |  |  |  | 10,836 |  |  |  | 7,363 |  |  |  |  |  |  |  | 7,363 |
B. Held-for-trading financial assets |  |  | 6,552 |  |  |  |  |  |  |  | 6,552 |  |  |  | 6,012 |  |  |  |  |  |  |  | 6,012 |
C. Available-for-sale financial assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 207 |  |  |  |  |  |  |  | 207 |
D. Liquidity (A+B+C) |  |  | 17,388 |  |  |  |  |  |  |  | 17,388 |  |  |  | 13,582 |  |  |  |  |  |  |  | 13,582 |
E. Financing receivables |  |  | 188 |  |  |  |  |  |  |  | 188 |  |  |  | 209 |  |  |  |  |  |  |  | 209 |
F. Short-term debt towards banks |  |  | 383 |  |  |  |  |  |  |  | 383 |  |  |  | 201 |  |  |  |  |  |  |  | 201 |
G. Long-term debt towards banks |  |  | 768 |  |  |  | 2,710 |  |  |  | 3,478 |  |  |  | 801 |  |  |  | 3,200 |  |  |  | 4,001 |
H. Bonds |  |  | 2,781 |  |  |  | 17,313 |  |  |  | 20,094 |  |  |  | 1,445 |  |  |  | 16,907 |  |  |  | 18,352 |
I. Short-term debt towards related parties |  |  | 661 |  |  |  |  |  |  |  | 661 |  |  |  | 164 |  |  |  |  |  |  |  | 164 |
L. Other short-term liabilities |  |  | 1,138 |  |  |  |  |  |  |  | 1,138 |  |  |  | 1,877 |  |  |  |  |  |  |  | 1,877 |
M. Other long-term liabilities |  |  | 52 |  |  |  | 59 |  |  |  | 111 |  |  |  | 40 |  |  |  | 72 |  |  |  | 112 |
N. Total borrowings (F+G+H+I+L+M) |  |  | 5,783 |  |  |  | 20,082 |  |  |  | 25,865 |  |  |  | 4,528 |  |  |  | 20,179 |  |  |  | 24,707 |
O. Net borrowings (N-D-E) |  |  | (11,793 | ) |  |  | 20,082 |  |  |  | 8,289 |  |  |  | (9,263 | ) |  |  | 20,179 |  |  |  | 10,916 |

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