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Investments - Additional information (Details)
bbl in Thousands, € in Millions
12 Months Ended
Dec. 31, 2019
EUR (€)
item
bbl
Dec. 31, 2018
EUR (€)
Dec. 31, 2017
EUR (€)
Investments      
Additions and subscriptions € 2,992 € 120  
Share of profit of equity-accounted investments 161 409  
Share of loss of equity-accounted investments 184 430  
Deduction for dividends 1,138 50  
Difference amount between purchase price of interest acquired and book value of corresponding fraction of net equity € 72    
Percentage of reasonable changes in cost of capital 1.00%    
Other investments € 929 919 € 219
Nigeria LNG Ltd      
Investments      
Other investments 657 651  
Saudi European Petrochemical Co      
Investments      
Other investments 146 € 144  
Lotte Versalis Elastomers Co Ltd      
Investments      
Additions and subscriptions € 39    
Associates | Abu Dhabi Oil Refining Co      
Investments      
Proportion of ownership interest acquired 20.00%    
Additions and subscriptions € 2,896    
Number of refineries operated | item 3    
Refining capacity per day | bbl 900    
Incremental global refining capacity (as a percent) 35.00%    
Associates | Angola LNG Ltd      
Investments      
Share of profit of equity-accounted investments € 47    
Associates | Novamont SpA      
Investments      
Difference amount between purchase price of interest acquired and book value of corresponding fraction of net equity 43    
Joint ventures | Var Energi AS      
Investments      
Share of profit of equity-accounted investments 49    
Deduction for dividends 1,057    
Increase (decrease) in book value of investments accounted using equity method (980)    
Joint ventures | Saipem SpA      
Investments      
Share of profit of equity-accounted investments 4    
Joint ventures | Cardon IV SA      
Investments      
Share of loss of equity-accounted investments € 90    
Proportion of ownership interest in joint venture 50.00%    
Joint ventures | Union Fenosa Gas SA      
Investments      
Difference amount between purchase price of interest acquired and book value of corresponding fraction of net equity € 29