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Exploration for evaluation of oil&gas resources | 12 Months Ended
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Dec. 31, 2018
Disclosure Of Exploration And Evaluation Of Oil and Gas Resources [Abstract] |
Disclosure Of Exploration And Evaluation Of Oil Gas Resources [Text Block] | 34 Exploration for evaluation of oil&gas resources
(€ million) |  | 2018 |  | 2017 |  | 2016
Revenues related to exploration activity and evaluation |  |  | 17 |  |  |  | 9 |  |  |  | 4 |
Exploration activity and evaluation costs |  |  |  |  |  |  |  |  |  |  |  |
- write-off of exploration and evaluation costs |  |  | 93 |  |  |  | 252 |  |  |  | 170 |
- costs of geological and geophysical studies |  |  | 287 |  |  |  | 273 |  |  |  | 204 |
Exploration expense for the year |  |  | 380 |  |  |  | 525 |  |  |  | 374 |
Intangible assets: proved and unproved exploration licence and leasehold property acquisition costs |  |  | 1,081 |  |  |  | 995 |  |  |  | 1,092 |
Tangible assets: capitalized exploration and evaluation costs |  |  | 1,267 |  |  |  | 1,371 |  |  |  | 1,905 |
Total tangible and intangible assets |  |  | 2,348 |  |  |  | 2,366 |  |  |  | 2,997 |
Provision for decommissioning related to exploration activity and evaluation |  |  | 77 |  |  |  | 81 |  |  |  | 118 |
Exploration expenditure (net cash used in investing activivties) |  |  | 463 |  |  |  | 442 |  |  |  | 417 |
Geological and geophysical costs (cash flow from operating activities) |  |  | 287 |  |  |  | 273 |  |  |  | 204 |
Total exploration effort |  |  | 750 |  |  |  | 715 |  |  |  | 621 |

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