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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 |  |

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