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Changes in accounting policies - Additional information (Details) - EUR (€)
€ in Millions
Dec. 31, 2019
Dec. 31, 2018
Initially applied IFRSs    
Right-of-use assets € 5,349  
Lease liabilities € 5,648  
Weighted average discount rate used to measure the lease liabilities as at January 1, 2019   6.80%
Increase (decrease) due to application of IFRS 16    
Initially applied IFRSs    
Right-of-use assets   € 5,689
Lease liabilities   5,800
Adoption of IFRS 16    
Initially applied IFRSs    
Right-of-use assets   5,656
Adoption of IFRS 16 | Followers    
Initially applied IFRSs    
Lease liabilities   2,000
Adoption of IFRS 16 | ENI SpA    
Initially applied IFRSs    
Lease liabilities   € 3,700