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Exploration for evaluation of oil&gas resources (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Exploration For Evaluation Of Oilgas Resources      
Revenues related to exploration activity and evaluation € 9 € 4 € 68
- 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 activities) 442 417 566
Geological and geophysical costs (cash flow from operating activities) 273 204 254
Total exploration effort € 715 € 621 € 820