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Other assets and liabilities - Additional information (Details) - EUR (€) € in Millions | Dec. 31, 2022 | Dec. 31, 2021
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Disclosure Of Detailed Information About Other Assets And Liabilities [Line Items] |  |
Value added tax receivables | € 569 | € 498
Current value added tax receivables | 432 | 340
Gas volume prepayments, current | 41 | 41
Gas volume prepayments, non-current | 357 | 94
Non-current receivables for investing activities |  | 23
Excise duties and consumer taxes | 613 | 700
Current value added tax payables | 332 | 248
Non-current cautionary deposits | 305 | 268
Value of gas not withdrawn by customers due to triggering of take-or-pay clause | 443 | 112
Payables related to investing activities | 83 | 103
Non-current payables related to investing activities | 79 |
Current payables related to investing activities | 4 |
Current tax credits related to renovation of residential buildings and energy saving | 366 | 110
Non-current tax credits related to renovation of residential buildings and energy saving | 903 | 324
Advances received from customers for future gas supplies | 538 | 77
Prepaid electronic fuel vouchers | 338 | 242
Current liabilities for prepaid revenues and income | 104 | 90
Non-current prepaid revenues and deferred income | 247 | 271
Miscellaneous other current assets | 292 |
Miscellaneous other non-current assets | 667 |
Miscellaneous current contract liabilities | 212 |
Non-current payables to factoring companies connected with the tax credit transfer | 758 | 240
Miscellaneous other current liabilities | 151 |
Miscellaneous other non-current liabilities | 461 |
within 1 year |  |
Disclosure Of Detailed Information About Other Assets And Liabilities [Line Items] |  |
Value of gas not withdrawn by customers due to triggering of take-or-pay clause | 85 | 73
Over 12 months |  |
Disclosure Of Detailed Information About Other Assets And Liabilities [Line Items] |  |
Value of gas not withdrawn by customers due to triggering of take-or-pay clause | 358 | 39
Gas and electricity |  |
Disclosure Of Detailed Information About Other Assets And Liabilities [Line Items] |  |
Non-current cautionary deposits | 222 | 223
Engie SA |  |
Disclosure Of Detailed Information About Other Assets And Liabilities [Line Items] |  |
Current advances received | 58 | 60
Non-current advances received | 275 | 333
Societa Oleodotti Meridionali SpA |  |
Disclosure Of Detailed Information About Other Assets And Liabilities [Line Items] |  |
Advances received | 430 | 391
Exploration & Production |  |
Disclosure Of Detailed Information About Other Assets And Liabilities [Line Items] |  |
Underlifting positions | 239 | 316
Current overlifting imbalances | € 479 | € 630

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- Definition The amount of current tax credits deriving from certain Italian tax measures to incentivize the renovation of residential buildings and energy saving by entitling contractors with a credit equal to the whole amount of works. + References No definition available. + Details
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- Definition The amount of non-current tax credits deriving from certain Italian tax measures to incentivize the renovation of residential buildings and energy saving by entitling contractors with a credit equal to the whole amount of works. + References No definition available. + Details
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- Definition The amount of current deferred income other than current contract liabilities. [Refer: Deferred income other than contract liabilities] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2022-03-24 -Paragraph 78 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_78&doctype=Standard -URIDate 2022-03-24 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2022-03-24 -Paragraph 55 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_55&doctype=Standard -URIDate 2022-03-24 + Details
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- Definition The amount of current excise tax payables. [Refer: Excise tax payables] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2022-03-24 -Paragraph 78 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_78&doctype=Standard -URIDate 2022-03-24 + Details
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- Definition The amount of current prepayments. [Refer: Prepayments] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 1 -IssueDate 2022-03-24 -Paragraph 78 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_78_b&doctype=Standard -URIDate 2022-03-24 + Details
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- Definition The amount of current value added tax payables. [Refer: Value added tax payables] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2022-03-24 -Paragraph 78 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_78&doctype=Standard -URIDate 2022-03-24 + Details
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- Definition The amount of non-current advances received representing non-current contract liabilities for performance obligations satisfied at a point in time. [Refer: Advances received, representing contract liabilities for performance obligations satisfied at point in time] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2022-03-24 -Paragraph 78 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_78&doctype=Standard -URIDate 2022-03-24 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2022-03-24 -Paragraph 55 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_55&doctype=Standard -URIDate 2022-03-24 + Details
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