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Other financial assets - Additional information (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Cardon IV SA    
Other financial assets    
Proportion of ownership interest in joint venture 50.00%  
Financing receivables held for operating purposes | Euro    
Other financial assets    
Other financial assets € 178  
Financing receivables held for operating purposes | US Dollars    
Other financial assets    
Other financial assets 1,024  
Financing receivables held for operating purposes | beyond 5 years    
Other financial assets    
Other financial assets 771 € 1,018
Financing receivables held for operating purposes | Cardon IV SA    
Other financial assets    
Other financial assets 383 € 563
Financing receivables held for operating purposes | Exploration & Production    
Other financial assets    
Other financial assets 883  
Non-current financing receivables held for operating purposes    
Other financial assets    
Fair value € 953  
Non-current financing receivables held for operating purposes | Minimum    
Other financial assets    
Discount rate applied to cash flow projections (0.50%) (0.30%)
Non-current financing receivables held for operating purposes | Maximum    
Other financial assets    
Discount rate applied to cash flow projections 1.40% 2.00%
Securities held for operating purposes    
Other financial assets    
Financial assets pledged as collateral for liabilities or contingent liabilities € 20 € 20
Securities held for operating purposes | Maximum    
Other financial assets    
Maturity of securities held for operating purposes 5 years