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Property, plant and equipment (Details 3) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
DisclosureOfPropertyPlantAndEquipmentExplanatoryLineItems [Line Items]      
Book amount at the beginning of the year € 70,793 € 68,005  
Additions 8,490 9,067  
Net reversals (impairments) 207 86  
Write-off 239 289 € 678
Net book amount at the end of the year 63,158 70,793 68,005
Unproved mineral interest [member]      
DisclosureOfPropertyPlantAndEquipmentExplanatoryLineItems [Line Items]      
Book amount at the beginning of the year 2,450 2,212  
Net reversals (impairments) 147 190  
Other changes and currency translation differences (312) 81  
Net book amount at the end of the year 2,390 2,450 2,212
Exploration Production Segment [Member]      
DisclosureOfPropertyPlantAndEquipmentExplanatoryLineItems [Line Items]      
Book amount at the beginning of the year 17,040 24,307  
Additions 7,653 8,181  
Net reversals (impairments) 23 (25)  
Write-off (230) (88)  
Reclassifications (9,938) (15,932)  
Other changes and currency translation differences (3,708) 597  
Net book amount at the end of the year 10,840 17,040 24,307
Exploration Production Segment [Member] | Exploratory wells in progress [member]      
DisclosureOfPropertyPlantAndEquipmentExplanatoryLineItems [Line Items]      
Book amount at the beginning of the year 221 93  
Additions 351 402  
Write-off (11)    
Reclassifications (438) (282)  
Other changes and currency translation differences (15) 8  
Net book amount at the end of the year 108 221 93
Exploration Production Segment [Member] | Exploratory wells completed and being evaluated [member]      
DisclosureOfPropertyPlantAndEquipmentExplanatoryLineItems [Line Items]      
Book amount at the beginning of the year 1,684 1,737  
Write-off (217) (109)  
Reclassifications 173 6  
Other changes and currency translation differences (377) 50  
Net book amount at the end of the year 1,263 1,684 1,737
Exploration Production Segment [Member] | Exploratory successful wells in progress [member]      
DisclosureOfPropertyPlantAndEquipmentExplanatoryLineItems [Line Items]      
Book amount at the beginning of the year 913 807  
Net reversals (impairments) (13) (5)  
Reclassifications (117) 78  
Other changes and currency translation differences (294) 33  
Net book amount at the end of the year 489 913 807
Exploration Production Segment [Member] | Exploration activity and appraisal [Member]      
DisclosureOfPropertyPlantAndEquipmentExplanatoryLineItems [Line Items]      
Book amount at the beginning of the year 2,818 2,637  
Additions 351 402  
Net reversals (impairments) (13) (5)  
Write-off (228) (109)  
Reclassifications (382) (198)  
Other changes and currency translation differences (686) 91  
Net book amount at the end of the year 1,860 2,818 2,637
Exploration Production Segment [Member] | Unproved mineral interest [member]      
DisclosureOfPropertyPlantAndEquipmentExplanatoryLineItems [Line Items]      
Book amount at the beginning of the year 2,450 2,212  
Additions 112 2  
Net reversals (impairments) 147 190  
Reclassifications (7) (35)  
Other changes and currency translation differences (312) 81  
Net book amount at the end of the year 2,390 2,450 2,212
Exploration Production Segment [Member] | Well and installments in progress [Member]      
DisclosureOfPropertyPlantAndEquipmentExplanatoryLineItems [Line Items]      
Book amount at the beginning of the year 11,690 19,458  
Additions 7,190 7,777  
Net reversals (impairments) (111) (210)  
Write-off (2) (6)  
Reclassifications (9,538) (15,699)  
Other changes and currency translation differences (2,676) 370  
Net book amount at the end of the year 6,553 11,690 19,458
Exploration Production Segment [Member] | Abandonment cost [member]      
DisclosureOfPropertyPlantAndEquipmentExplanatoryLineItems [Line Items]      
Book amount at the beginning of the year 82    
Write-off   27  
Reclassifications (11)    
Other changes and currency translation differences (34) 55  
Net book amount at the end of the year 37 82  
Exploration Production Segment [Member] | Other tangible assets in progress [Member]      
DisclosureOfPropertyPlantAndEquipmentExplanatoryLineItems [Line Items]      
Book amount at the beginning of the year 14,222 21,670  
Additions 7,302 7,779  
Net reversals (impairments) 36 (20)  
Write-off (2) 21  
Reclassifications (9,556) (15,734)  
Other changes and currency translation differences (3,022) 506  
Net book amount at the end of the year € 8,980 € 14,222 € 21,670