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Other assets and liabilities - Additional information (Details) - EUR (€) € in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Disclosure Of Detailed Information About Other Assets And Liabilities [Line Items] |  |
Value added tax receivables | € 755 | € 569
Current value added tax receivables | 637 | 432
Gas volume prepayments, current |  | 41
Gas volume prepayments, non-current | 307 | 357
Non-current receivables for investing activities | 205 | 23
Current advances received | 56 | 58
Non-current advances received | 275 | 333
Advances received | 469 | 430
Excise duties and consumer taxes | 1,034 | 613
Current value added tax payables | 326 | 332
Non-current cautionary deposits | 286 | 305
Value of gas not withdrawn by customers due to triggering of take-or-pay clause | 391 | 443
Payables related to investing activities | 101 | 83
Current tax credits related to renovation of residential buildings and energy saving | 812 | 366
Non-current tax credits related to renovation of residential buildings and energy saving | 2,247 | 903
Advances received from customers for future gas supplies | 10 | 538
Prepaid electronic fuel vouchers | 292 | 338
Current liabilities for prepaid revenues and income | 134 | 104
Non-current payables to factoring companies connected with the tax credit transfer | 2,040 | 758
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Value of gas not withdrawn by customers due to triggering of take-or-pay clause | 131 | 85
Gas and electricity |  |
Disclosure Of Detailed Information About Other Assets And Liabilities [Line Items] |  |
Non-current cautionary deposits | 213 | 222
Exploration & Production |  |
Disclosure Of Detailed Information About Other Assets And Liabilities [Line Items] |  |
Underlifting positions | 295 | 239
Current overlifting imbalances | € 312 | € 479

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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- Definition The amount of gas not withdrawn by customers due to triggering of take-or-pay clause. + References No definition available. + Details
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- Definition The amount of non-current payables to factoring companies in relation to the tax credit transfer. + 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 advances received representing 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 2023-01-01 -Paragraph 78 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_78&doctype=Standard -URIDate 2023-03-23 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 55 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_55&doctype=Standard -URIDate 2023-03-23 + 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 2023-01-01 -Paragraph 78 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_78&doctype=Standard -URIDate 2023-03-23 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 55 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_55&doctype=Standard -URIDate 2023-03-23 + 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 2023-01-01 -Paragraph 78 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_78&doctype=Standard -URIDate 2023-03-23 + 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 2023-01-01 -Paragraph 78 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_78_b&doctype=Standard -URIDate 2023-03-23 + 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 2023-01-01 -Paragraph 78 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_78&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The amount of current value added tax receivables. [Refer: Value added tax receivables] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 78 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_78_b&doctype=Standard -URIDate 2023-03-23 + 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 2023-01-01 -Paragraph 78 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_78&doctype=Standard -URIDate 2023-03-23 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 55 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_55&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The amount of non-current deposits from customers. [Refer: Deposits from customers] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 55 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_55&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The amount of non-current prepayments. [Refer: Prepayments] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 78 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_78_b&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The amount of receivables related to a value added tax. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 78 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_78_b&doctype=Standard -URIDate 2023-03-23 + Details
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