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Exploration for evaluation of oil&gas resources (Details)
€ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2018
EUR (€)
Dec. 31, 2017
EUR (€)
Dec. 31, 2016
EUR (€)
Dec. 31, 2018
USD ($)
Disclosure Of Exploration And Evaluation Of Oil And Gas Resources [Line Items]        
Intangible assets: proved and unproved exploration licence and leasehold property acquisition costs € 1,081 € 995    
Provision for decommissioning related to exploration activity and evaluation   7,638   $ 7,757
Exploration for evaluation of oil & gas resources [Member]        
Disclosure Of Exploration And Evaluation Of Oil And Gas Resources [Line Items]        
Revenues related to exploration activity and evaluation 17 9 € 4  
- 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