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Exploration for evaluation of oil&gas resources (Tables) | 12 Months Ended
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Dec. 31, 2017
Exploration For Evaluation Of Oilgas Resources |
Disclosure of detailed information about Exploration and evaluation of oil and gas resources [Text Block] |
(€ million) |  | 2017 |  | 2016 |  | 2015
Revenues related to exploration activity and evaluation |  |  | 9 |  |  |  | 4 |  |  |  | 68 |
Exploration activity and evaluation costs |  |  |  |  |  |  |  |  |  |  |  |
- write-off of exploration and evaluation costs |  |  | 252 |  |  |  | 170 |  |  |  | 617 |
- other exploration costs |  |  | 273 |  |  |  | 204 |  |  |  | 254 |
Exploration expense for the year |  |  | 525 |  |  |  | 374 |  |  |  | 871 |
Intangible assets: proved and unproved exploration licence and leasehold property acquisition costs |  |  | 995 |  |  |  | 1,092 |  |  |  | 735 |
Tangible assets: capitalized exploration and evaluation costs |  |  | 1,860 |  |  |  | 2,818 |  |  |  | 2,637 |
Total tangible and intangible assets |  |  | 2,855 |  |  |  | 3,910 |  |  |  | 3,372 |
Provision for decommissioning related to exploration activity and evaluation |  |  | 81 |  |  |  | 118 |  |  |  | 131 |
Exploration expenditure (net cash used in investing activivties) |  |  | 442 |  |  |  | 417 |  |  |  | 566 |
Geological and geophysical costs (cash flow from operating activities) |  |  | 273 |  |  |  | 204 |  |  |  | 254 |
Total exploration effort |  |  | 715 |  |  |  | 621 |  |  |  | 820 |

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