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Provisions for employee benefits - Additional information (Details) - EUR (€) € in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Disclosure Of Benefit Plans [Line Items] |  |
Net benefit liability (asset) | € 748 | € 786
Estimate of contributions expected to be paid to plan for next annual reporting period | 147 | 40
Defined benefit plan |  |
Disclosure Of Benefit Plans [Line Items] |  |
Net benefit liability (asset) | 395 | 445
Other benefit plans |  |
Disclosure Of Benefit Plans [Line Items] |  |
Net benefit liability (asset) | 353 | € 341
Deferred monetary incentive plans |  |
Disclosure Of Benefit Plans [Line Items] |  |
Net benefit liability (asset) | 120 |
Expansion contracts for workers |  |
Disclosure Of Benefit Plans [Line Items] |  |
Net benefit liability (asset) | 118 |
Isopensione |  |
Disclosure Of Benefit Plans [Line Items] |  |
Net benefit liability (asset) | 77 |
Jubilee Awards |  |
Disclosure Of Benefit Plans [Line Items] |  |
Net benefit liability (asset) | 26 |
Other Long term Plans |  |
Disclosure Of Benefit Plans [Line Items] |  |
Net benefit liability (asset) | € 12 |

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- Definition The estimate of the expected contributions to be made to a defined benefit plan for the next annual reporting period. [Refer: Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2023-01-01 -Paragraph 147 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_147_b&doctype=Standard -URIDate 2023-03-23 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2023-01-01 -Paragraph 148 -Subparagraph d -Clause iii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_148_d_iii&doctype=Standard -URIDate 2023-03-23 + Details
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