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Trade and other receivables (Details 2) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2018
Jan. 01, 2018
Dec. 31, 2017
Disclosure Of Trade And Other Receivables [Line Items]      
Trade and other current receivables gross € 17,251    
Allowance for doubtful accounts (3,150)    
Trade and other current receivables € 14,101 € 14,156 € 15,421
Expected loss (% net of counterpart risk mitigation factors)    
Business customers [Member]      
Disclosure Of Trade And Other Receivables [Line Items]      
Trade and other current receivables gross € 8,541    
National Oil Companies and public administrations [Member]      
Disclosure Of Trade And Other Receivables [Line Items]      
Trade and other current receivables gross 4,338    
Other counterparties [Member]      
Disclosure Of Trade And Other Receivables [Line Items]      
Trade and other current receivables gross 4,372    
Defaulted receivables [Member]      
Disclosure Of Trade And Other Receivables [Line Items]      
Trade and other current receivables gross 3,838    
Allowance for doubtful accounts (2,237)    
Trade and other current receivables € 1,601    
Expected loss (% net of counterpart risk mitigation factors) 62.50%    
Defaulted receivables [Member] | Business customers [Member]      
Disclosure Of Trade And Other Receivables [Line Items]      
Trade and other current receivables gross € 1,350    
Defaulted receivables [Member] | National Oil Companies and public administrations [Member]      
Disclosure Of Trade And Other Receivables [Line Items]      
Trade and other current receivables gross 2,217    
Defaulted receivables [Member] | Other counterparties [Member]      
Disclosure Of Trade And Other Receivables [Line Items]      
Trade and other current receivables gross € 271    
Eni gas e luce customers [Member]      
Disclosure Of Trade And Other Receivables [Line Items]      
Expected loss (% net of counterpart risk mitigation factors) 36.10%    
Retail customers [Member]      
Disclosure Of Trade And Other Receivables [Line Items]      
Trade and other current receivables gross € 2,374    
Allowance for doubtful accounts (857)    
Trade and other current receivables € 1,517    
Expected loss (% net of counterpart risk mitigation factors) 36.10%    
Retail customers [Member] | Business customers [Member]      
Disclosure Of Trade And Other Receivables [Line Items]      
Trade and other current receivables gross    
Retail customers [Member] | National Oil Companies and public administrations [Member]      
Disclosure Of Trade And Other Receivables [Line Items]      
Trade and other current receivables gross    
Retail customers [Member] | Other counterparties [Member]      
Disclosure Of Trade And Other Receivables [Line Items]      
Trade and other current receivables gross 2,374    
Low risk [Member]      
Disclosure Of Trade And Other Receivables [Line Items]      
Trade and other current receivables gross 5,240    
Allowance for doubtful accounts (9)    
Trade and other current receivables € 5,231    
Expected loss (% net of counterpart risk mitigation factors) 0.20%    
Low risk [Member] | Business customers [Member]      
Disclosure Of Trade And Other Receivables [Line Items]      
Trade and other current receivables gross € 2,454    
Low risk [Member] | National Oil Companies and public administrations [Member]      
Disclosure Of Trade And Other Receivables [Line Items]      
Trade and other current receivables gross 1,292    
Low risk [Member] | Other counterparties [Member]      
Disclosure Of Trade And Other Receivables [Line Items]      
Trade and other current receivables gross 1,494    
Medium Risk [Member]      
Disclosure Of Trade And Other Receivables [Line Items]      
Trade and other current receivables gross 3,819    
Allowance for doubtful accounts (3)    
Trade and other current receivables € 3,816    
Expected loss (% net of counterpart risk mitigation factors) 0.10%    
Medium Risk [Member] | Business customers [Member]      
Disclosure Of Trade And Other Receivables [Line Items]      
Trade and other current receivables gross € 3,585    
Medium Risk [Member] | National Oil Companies and public administrations [Member]      
Disclosure Of Trade And Other Receivables [Line Items]      
Trade and other current receivables gross 157    
Medium Risk [Member] | Other counterparties [Member]      
Disclosure Of Trade And Other Receivables [Line Items]      
Trade and other current receivables gross 77    
High Risk [Member]      
Disclosure Of Trade And Other Receivables [Line Items]      
Trade and other current receivables gross 1,980    
Allowance for doubtful accounts (44)    
Trade and other current receivables € 1,936    
Expected loss (% net of counterpart risk mitigation factors) 2.60%    
High Risk [Member] | Business customers [Member]      
Disclosure Of Trade And Other Receivables [Line Items]      
Trade and other current receivables gross € 1,152    
High Risk [Member] | National Oil Companies and public administrations [Member]      
Disclosure Of Trade And Other Receivables [Line Items]      
Trade and other current receivables gross 672    
High Risk [Member] | Other counterparties [Member]      
Disclosure Of Trade And Other Receivables [Line Items]      
Trade and other current receivables gross € 156