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Property, plant and equipment (Details Textual) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
DisclosureOfPropertyPlantAndEquipmentExplanatoryLineItems [Line Items]      
Borrowing costs capitalised € 72 € 105  
Write-Off of tangible assets 239 289 € 678
Increase (decrease) through net exchange differences, property, plant and equipment (7,025) 1,886  
Increase (decrease) through other changes, property, plant and equipment (421) (643)  
Provision for decommissioning, restoration and rehabilitation costs 81 118 131
Property, plant and equipment, pledged as security 24 24  
Government grants 110 90  
Disposals Property Plant And Equipment (1,448)    
Deferred consideration 553 663  
Deferred consideration due in next one year 442 530  
Wells suspended 217    
Exploration area under development 648    
Reclassification due to development wells and plants 9,538    
Reclassification due to exploratory wells 382    
Reclassification wells in progress to completed 438    
Property plant and equipment € 63,158 70,793 68,005
Exxon mobil [Member]      
DisclosureOfPropertyPlantAndEquipmentExplanatoryLineItems [Line Items]      
Proportion Of Ownership Interest In Joint Operation 35.70%    
BP [Member]      
DisclosureOfPropertyPlantAndEquipmentExplanatoryLineItems [Line Items]      
Percentage of interest sold 10.00%    
Rosneft [Member]      
DisclosureOfPropertyPlantAndEquipmentExplanatoryLineItems [Line Items]      
Percentage of interest sold 30.00%    
Accumulated impairment [member]      
DisclosureOfPropertyPlantAndEquipmentExplanatoryLineItems [Line Items]      
Provisions € 16,005 17,558  
Property plant and equipment 120,619 126,479  
Unsuccessful Exploration [Member]      
DisclosureOfPropertyPlantAndEquipmentExplanatoryLineItems [Line Items]      
Write-Off of tangible assets 228    
Unproved Mineral Interest [Member]      
DisclosureOfPropertyPlantAndEquipmentExplanatoryLineItems [Line Items]      
Property plant and equipment € 2,390 € 2,450 2,212
Nigeria Government [Member]      
DisclosureOfPropertyPlantAndEquipmentExplanatoryLineItems [Line Items]      
Proportion of ownership interest in property 50.00%    
Shell [Member]      
DisclosureOfPropertyPlantAndEquipmentExplanatoryLineItems [Line Items]      
Proportion of ownership interest in property 50.00%    
Zohr asset in Egypt [Member]      
DisclosureOfPropertyPlantAndEquipmentExplanatoryLineItems [Line Items]      
Disposals Property Plant And Equipment € 1,328    
Percentage of interest sold 40.00%    
Gains On Disposals Of Property Plant And Equipment € 1,281    
Zohr [Member]      
DisclosureOfPropertyPlantAndEquipmentExplanatoryLineItems [Line Items]      
Non current Assets Or Disposal Groups Classified As Held For Sale € 1,488    
Percentage of business entity 40.00%    
Proceeds From Disposal Of Non current Assets Or Disposal Groups Classified As Held For Sale And Discontinued Operations € 1,328    
Bottom Of Range [Member]      
DisclosureOfPropertyPlantAndEquipmentExplanatoryLineItems [Line Items]      
Interest rates used for capitalizing finance expense 1.60% 2.70%  
Top Of Range [Member]      
DisclosureOfPropertyPlantAndEquipmentExplanatoryLineItems [Line Items]      
Interest rates used for capitalizing finance expense 2.70% 5.30%  
Exploration & Production Segment [Member]      
DisclosureOfPropertyPlantAndEquipmentExplanatoryLineItems [Line Items]      
Borrowing costs capitalised € 90    
Write-Off of tangible assets 237 € 93  
Provision for decommissioning, restoration and rehabilitation costs 355 665  
Property plant and equipment 56,833 64,428  
Exploration & Production Segment [Member] | Accumulated impairment [member]      
DisclosureOfPropertyPlantAndEquipmentExplanatoryLineItems [Line Items]      
Property plant and equipment 95,775 101,131  
Refining & Marketing and Chemical segment [Member]      
DisclosureOfPropertyPlantAndEquipmentExplanatoryLineItems [Line Items]      
Recognised finance lease as assets 29 29  
Property plant and equipment 4,929 4,642  
Refining & Marketing and Chemical segment [Member] | Accumulated impairment [member]      
DisclosureOfPropertyPlantAndEquipmentExplanatoryLineItems [Line Items]      
Property plant and equipment 19,625 19,477  
Exploration Production Segment [Member]      
DisclosureOfPropertyPlantAndEquipmentExplanatoryLineItems [Line Items]      
Write-Off of tangible assets (230) (88)  
Provision for decommissioning, restoration and rehabilitation costs 7,649    
Reclassifications of property plant and equipment (9,938) (15,932)  
Property plant and equipment 10,840 17,040 24,307
Exploration Production Segment [Member] | Well and installments in progress [Member]      
DisclosureOfPropertyPlantAndEquipmentExplanatoryLineItems [Line Items]      
Write-Off of tangible assets (2) (6)  
Reversal of impairment loss recognised in profit or loss, property, plant and equipment (111)    
Reclassifications of property plant and equipment (9,538) (15,699)  
Property plant and equipment 6,553 11,690 19,458
Exploration Production Segment [Member] | Unproved Mineral Interest [Member]      
DisclosureOfPropertyPlantAndEquipmentExplanatoryLineItems [Line Items]      
Reclassifications of property plant and equipment (7) (35)  
Property plant and equipment € 2,390 € 2,450 € 2,212