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Property, plant and equipment - Additional information (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Property, plant and equipment        
Borrowing costs capitalised € 93 € 52 € 73  
Capital expenditure 8,049 8,778    
Currency translation differences 1,044 2,098    
Write-off 270 84    
Property, plant and equipment 62,192 60,302 63,158  
Property, plant and equipment subject to leases 241      
Property, plant and equipment, pledged as security 24 24    
Government grants € 112 € 125    
Minimum        
Property, plant and equipment        
Interest rate used for capitalizing finance expense 2.60% 2.30%    
Maximum        
Property, plant and equipment        
Interest rate used for capitalizing finance expense 2.80% 2.40%    
Accumulated impairment        
Property, plant and equipment        
Property, plant and equipment € (18,226) € (16,471)    
USD        
Property, plant and equipment        
Currency translation differences 976      
Nigeria | Oil Prospecting License 245        
Property, plant and equipment        
Property, plant and equipment 1,184      
Unproved mineral interest        
Property, plant and equipment        
Capital expenditure 256 592    
Currency translation differences 52      
Property, plant and equipment 2,162 2,478 2,390  
Unproved mineral interest | Nigeria | Oil Prospecting License 245        
Property, plant and equipment        
Property, plant and equipment € 874      
Unproved mineral interest | Nigeria | Oil Prospecting License 245 | Shell        
Property, plant and equipment        
Proportion of ownership interest in joint operation 50.00%      
Unproved mineral interest | Nigeria | Oil Prospecting License 245 | Nigeria Government        
Property, plant and equipment        
Proportion of ownership interest in joint operation 50.00%      
E&P wells, plant and machinery        
Property, plant and equipment        
Capital expenditure € 144 432    
Currency translation differences 815 1,623    
Write-off   12    
Property, plant and equipment 46,492 42,856 45,782  
E&P wells, plant and machinery | Egypt, Mexico, Libya, Ghana and Angola        
Property, plant and equipment        
Transfers 4,560      
E&P exploration assets and appraisal        
Property, plant and equipment        
Capital expenditure 508 330    
Currency translation differences 24 53    
Transfers (46)      
Write-off 216 66    
Property, plant and equipment 1,563 1,267 1,371  
E&P exploration assets and appraisal | Australia, Kazakhstan, Pakistan, China and United Kingdom        
Property, plant and equipment        
Write-off 183      
Suspended exploration wells pending final determination        
Property, plant and equipment        
Currency translation differences 21 49 (178)  
Property, plant and equipment 1,246 1,101 € 1,263 € 1,684
Exploration wells in progress        
Property, plant and equipment        
Property, plant and equipment 317      
Exploration & Production        
Property, plant and equipment        
Borrowing costs capitalised 71 37    
Capital expenditure 6,889 € 7,757    
Exploration & Production | Proved and unproved mineral interest | USA        
Property, plant and equipment        
Capital expenditure € 400