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Property, plant and equipment - Additional information (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Property, plant and equipment        
Borrowing costs capitalised € 68 € 73 € 93  
Capital expenditure 4,950 4,407    
Currency translation differences 3,688 (4,140)    
Initial recognition and changes in estimates 195 955    
Changes in the scope of consolidation (252)      
Write-off 352 305    
Property, plant and equipment 56,299 53,943 62,192  
Property, plant and equipment, pledged as security 24 24    
Government grants 105 € 103    
Spanish Egyptian Gas Co SAE        
Property, plant and equipment        
Changes in the scope of consolidation 176      
Mozambique Rovuma Venture SpA        
Property, plant and equipment        
Changes in the scope of consolidation (1,318)      
Property, plant and equipment subject to operating leases        
Property, plant and equipment        
Property, plant and equipment € 372      
Minimum        
Property, plant and equipment        
Interest rate used for capitalizing finance expense 0.40% 1.30%    
Maximum        
Property, plant and equipment        
Interest rate used for capitalizing finance expense 2.10% 2.20%    
Accumulated impairment        
Property, plant and equipment        
Property, plant and equipment € (20,796) € (20,343)    
Estimated costs for social projects        
Property, plant and equipment        
Initial recognition and changes in estimates 134      
US Dollars        
Property, plant and equipment        
Currency translation differences € 3,603      
Nigeria | OML 17 property        
Property, plant and equipment        
Percentage of interest divested 5.00%      
Nigeria | Oil Prospecting License 245        
Property, plant and equipment        
Property, plant and equipment € 1,176      
Unproved mineral interest        
Property, plant and equipment        
Capital expenditure 9 57    
Currency translation differences 153 (170)    
Property, plant and equipment 1,819 1,763 2,162  
Unproved mineral interest | Nigeria | Oil Prospecting License 245        
Property, plant and equipment        
Property, plant and equipment € 867      
Unproved mineral interest | Nigeria | Oil Prospecting License 245 | International oil company        
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 € 8 6    
Currency translation differences 2,956 (3,325)    
Initial recognition and changes in estimates 200 870    
Property, plant and equipment 42,342 39,648 46,492  
E&P wells, plant and machinery | Indonesia, Egypt, Kazakhstan, United States, Angola, Italy, Iraq and Mexico        
Property, plant and equipment        
Transfers 3,556      
E&P exploration assets and appraisal        
Property, plant and equipment        
Capital expenditure 380 265    
Currency translation differences 106 (119)    
Initial recognition and changes in estimates (9) (9)    
Changes in the scope of consolidation (199)      
Write-off 331 296    
Property, plant and equipment 1,244 1,341 1,563  
E&P exploration assets and appraisal | Gabon, Montenegro, Myanmar, Bahrain, Egypt and Angola        
Property, plant and equipment        
Write-off 331      
Suspended exploration wells pending final determination        
Property, plant and equipment        
Currency translation differences 100 (112) 21  
Changes in the scope of consolidation (199)      
Property, plant and equipment 1,101 1,268 1,246 € 1,101
Exploration wells in progress        
Property, plant and equipment        
Property, plant and equipment 136      
Exploration & Production        
Property, plant and equipment        
Borrowing costs capitalised 54 51    
Capital expenditure 3,843 3,444    
Plenitude & Power        
Property, plant and equipment        
Changes in the scope of consolidation 658      
Plenitude & Power | Italy        
Property, plant and equipment        
Changes in the scope of consolidation 423      
fields including commercial discoveries that proceeds to sanctioning | Suspended exploration wells pending final determination        
Property, plant and equipment        
Property, plant and equipment € 359 € 480 € 505