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Exploration for evaluation of oil&gas resources (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Exploration for evaluation of oil&gas resources      
Revenues related to exploration activity and evaluation   € 34 € 17
- write-off of exploration and evaluation costs € 314 214 93
- costs of geological and geophysical studies 196 275 287
Exploration expense for the year 510 489 380
Intangible assets: proved and unproved exploration licence and leasehold property acquisition costs 888 1,031 1,081
Tangible assets: capitalized exploration and evaluation costs 1,341 1,563 1,267
Total tangible and intangible assets 2,229 2,594 2,348
Provision for decommissioning related to exploration activity and evaluation 93 109 77
Exploration expenditure (net cash used in investing activities) 283 586 463
Geological and geophysical costs (cash flow from operating activities) 196 275 287
Total exploration effort € 479 € 861 € 750