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Guarantees, commitments and risks - Guarantees (Details) - EUR (€)
€ in Millions
Dec. 31, 2019
Dec. 31, 2018
Guarantees    
Guarantees € 8,862 € 9,497
Consolidated subsidiaries    
Guarantees    
Guarantees 4,323 5,082
Investments in unconsolidated entities controlled by Eni    
Guarantees    
Guarantees 197 196
Joint ventures and associates    
Guarantees    
Guarantees 4,075 4,056
Others    
Guarantees    
Guarantees € 267 € 163