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Property, plant and equipment (Details 4) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure Of Property Plant And Equipment Explanatory [Line Items]    
Net book amount - beginning of the year € 63,158 € 70,793
Additions 8,778 8,490
Reclassification to proved mineral interest
Net book amount - end of the year 60,302 63,158
Unproved Mineral Interest [Member]    
Disclosure Of Property Plant And Equipment Explanatory [Line Items]    
Net book amount - beginning of the year 2,390 2,450
Additions 592 112
Net (impairments) reversals (505) 147
Reclassification to proved mineral interest (110) (7)
Other changes and currency translation differences 111 (312)
Net book amount - end of the year 2,478 2,390
Unproved Mineral Interest [Member] | Congo [Member]    
Disclosure Of Property Plant And Equipment Explanatory [Line Items]    
Net book amount - beginning of the year 1,162 1,254
Additions 26
Net (impairments) reversals (429) 72
Reclassification to proved mineral interest (32) (7)
Other changes and currency translation differences 42 (157)
Net book amount - end of the year 769 1,162
Unproved Mineral Interest [Member] | Nigeria [Member]    
Disclosure Of Property Plant And Equipment Explanatory [Line Items]    
Net book amount - beginning of the year 825 938
Additions 56
Net (impairments) reversals  
Reclassification to proved mineral interest  
Other changes and currency translation differences 40 (113)
Net book amount - end of the year 921 825
Unproved Mineral Interest [Member] | Turkmenistan [Member]    
Disclosure Of Property Plant And Equipment Explanatory [Line Items]    
Net book amount - beginning of the year 192 138
Additions  
Net (impairments) reversals (76) 75
Reclassification to proved mineral interest (44)
Other changes and currency translation differences 5 (21)
Net book amount - end of the year 77 192
Unproved Mineral Interest [Member] | USA [Member]    
Disclosure Of Property Plant And Equipment Explanatory [Line Items]    
Net book amount - beginning of the year 99 113
Additions  
Net (impairments) reversals  
Reclassification to proved mineral interest  
Other changes and currency translation differences 4 (14)
Net book amount - end of the year 103 99
Unproved Mineral Interest [Member] | Algeria [Member]    
Disclosure Of Property Plant And Equipment Explanatory [Line Items]    
Net book amount - beginning of the year 105
Additions   112
Net (impairments) reversals  
Reclassification to proved mineral interest (32)
Other changes and currency translation differences 4 (7)
Net book amount - end of the year 77 105
Unproved Mineral Interest [Member] | Egypt [Member]    
Disclosure Of Property Plant And Equipment Explanatory [Line Items]    
Net book amount - beginning of the year 7 7
Additions 23
Net (impairments) reversals  
Reclassification to proved mineral interest (2)
Other changes and currency translation differences 1
Net book amount - end of the year 29 € 7
Unproved Mineral Interest [Member] | United Arab Emirates [Member]    
Disclosure Of Property Plant And Equipment Explanatory [Line Items]    
Additions 487  
Other changes and currency translation differences 15  
Net book amount - end of the year € 502