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Property, plant and equipment (Details 6) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
DisclosureOfPropertyPlantAndEquipmentExplanatoryLineItems [Line Items]    
Book amount at the beginning of the year € 70,793 € 68,005
Additions 8,490 9,067
Net (impairments) reversals 207 86
Net book amount at the end of the year 63,158 70,793
Unproved Mineral Interest [Member]    
DisclosureOfPropertyPlantAndEquipmentExplanatoryLineItems [Line Items]    
Book amount at the beginning of the year 2,450 2,212
Additions 112 2
Net (impairments) reversals 147 190
Reclassification to proved mineral interest (7) (35)
Other changes and currency translation differences (312) 81
Net book amount at the end of the year 2,390 2,450
Unproved Mineral Interest [Member] | Congo [Member]    
DisclosureOfPropertyPlantAndEquipmentExplanatoryLineItems [Line Items]    
Book amount at the beginning of the year 1,254 1,021
Net (impairments) reversals 72 190
Reclassification to proved mineral interest (7)  
Other changes and currency translation differences (157) 43
Net book amount at the end of the year 1,162 1,254
Unproved Mineral Interest [Member] | Nigeria [Member]    
DisclosureOfPropertyPlantAndEquipmentExplanatoryLineItems [Line Items]    
Book amount at the beginning of the year 938 908
Other changes and currency translation differences (113) 30
Net book amount at the end of the year 825 938
Unproved Mineral Interest [Member] | Turkmenistan [Member]    
DisclosureOfPropertyPlantAndEquipmentExplanatoryLineItems [Line Items]    
Book amount at the beginning of the year 138 165
Net (impairments) reversals 75  
Reclassification to proved mineral interest   (31)
Other changes and currency translation differences (21) 4
Net book amount at the end of the year 192 138
Unproved Mineral Interest [Member] | USA [Member]    
DisclosureOfPropertyPlantAndEquipmentExplanatoryLineItems [Line Items]    
Book amount at the beginning of the year 113 109
Other changes and currency translation differences (14) 4
Net book amount at the end of the year 99 113
Unproved Mineral Interest [Member] | Algeria [Member]    
DisclosureOfPropertyPlantAndEquipmentExplanatoryLineItems [Line Items]    
Additions 112  
Other changes and currency translation differences (7)  
Net book amount at the end of the year 105  
Unproved Mineral Interest [Member] | Egypt [Member]    
DisclosureOfPropertyPlantAndEquipmentExplanatoryLineItems [Line Items]    
Book amount at the beginning of the year 7 9
Additions   2
Reclassification to proved mineral interest   (4)
Net book amount at the end of the year € 7 € 7