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Exploration for evaluation of oil&gas resources (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Exploration for evaluation of oil&gas resources      
Revenues related to exploration activity and evaluation € 34 € 17 € 9
- write-off of exploration and evaluation costs 214 93 252
- costs of geological and geophysical studies 275 287 273
Exploration expense for the year 489 380 525
Intangible assets: proved and unproved exploration licence and leasehold property acquisition costs 1,031 1,081 995
Tangible assets: capitalized exploration and evaluation costs 1,563 1,267 1,371
Total tangible and intangible assets 2,594 2,348 2,366
Provision for decommissioning related to exploration activity and evaluation 109 77 81
Exploration expenditure (net cash used in investing activities) 586 463 442
Geological and geophysical costs (cash flow from operating activities) 275 287 273
Total exploration effort € 861 € 750 € 715