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Provisions for employee benefits - Costs charged to the profit and loss account (Details) - EUR (€) € in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Disclosure Of Benefit Plans [Line Items] |  |
Current service cost | € 64 | € 67
Past service cost and (gains) losses on settlements | 84 | 127
- interest cost on liabilities | 49 | 29
- interest income on plan assets | (19) | (18)
Interest cost (income), net | 30 | 11
Remeasurements for long-term plans | (2) | (22)
Administrative fees paid |  | 1
Total | 176 | 184
Payroll and related costs |  |
Disclosure Of Benefit Plans [Line Items] |  |
Interest cost (income), net | 10 | 1
Total | 156 | 174
Financial income (expense) |  |
Disclosure Of Benefit Plans [Line Items] |  |
Interest cost (income), net | 20 | 10
Total | 20 | 10
Other benefit plans |  |
Disclosure Of Benefit Plans [Line Items] |  |
Current service cost | 51 | 52
Past service cost and (gains) losses on settlements | 91 | 127
- interest cost on liabilities | 10 | 1
Interest cost (income), net | 10 | 1
Remeasurements for long-term plans | (2) | (22)
Total | 150 | 158
Other benefit plans | Payroll and related costs |  |
Disclosure Of Benefit Plans [Line Items] |  |
Interest cost (income), net | 10 | 1
Total | 150 | 158
Defined benefit plan |  |
Disclosure Of Benefit Plans [Line Items] |  |
Current service cost | 13 | 15
Past service cost and (gains) losses on settlements | (7) |
- interest cost on liabilities | 39 | 28
- interest income on plan assets | (19) | (18)
Interest cost (income), net | 20 | 10
Administrative fees paid |  | 1
Total | 26 | 26
Defined benefit plan | Payroll and related costs |  |
Disclosure Of Benefit Plans [Line Items] |  |
Interest cost (income), net |  | 10
Total | 6 | 16
Defined benefit plan | Financial income (expense) |  |
Disclosure Of Benefit Plans [Line Items] |  |
Interest cost (income), net | 20 |
Total | 20 | 10
Italian defined benefit plans |  |
Disclosure Of Benefit Plans [Line Items] |  |
Current service cost | 1 | 1
Past service cost and (gains) losses on settlements | 2 |
- interest cost on liabilities | 6 | 2
Interest cost (income), net | 6 | 2
Total | 9 | 3
Italian defined benefit plans | Payroll and related costs |  |
Disclosure Of Benefit Plans [Line Items] |  |
Total | 3 | 1
Italian defined benefit plans | Financial income (expense) |  |
Disclosure Of Benefit Plans [Line Items] |  |
Interest cost (income), net | 6 | 2
Total | 6 | 2
Foreign defined benefit plan |  |
Disclosure Of Benefit Plans [Line Items] |  |
Current service cost | 10 | 11
Past service cost and (gains) losses on settlements | (13) |
- interest cost on liabilities | 29 | 24
- interest income on plan assets | (19) | (18)
Interest cost (income), net | 10 | 6
Administrative fees paid |  | 1
Total | 7 | 18
Foreign defined benefit plan | Payroll and related costs |  |
Disclosure Of Benefit Plans [Line Items] |  |
Total | (3) | 12
Foreign defined benefit plan | Financial income (expense) |  |
Disclosure Of Benefit Plans [Line Items] |  |
Interest cost (income), net | 10 | 6
Total | 10 | 6
FISDE and other foreign medical plans |  |
Disclosure Of Benefit Plans [Line Items] |  |
Current service cost | 2 | 3
Past service cost and (gains) losses on settlements | 4 |
- interest cost on liabilities | 4 | 2
Interest cost (income), net | 4 | 2
Total | 10 | 5
FISDE and other foreign medical plans | Payroll and related costs |  |
Disclosure Of Benefit Plans [Line Items] |  |
Total | 6 | 3
FISDE and other foreign medical plans | Financial income (expense) |  |
Disclosure Of Benefit Plans [Line Items] |  |
Interest cost (income), net | 4 | 2
Total | € 4 | € 2

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- Definition Represent the gain loss on remeasurement of long term plans. + References No definition available. + Details
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- Definition The amount of administration costs in the current period related to defined benefit plans that are not reflected in the return on plan assets. [Refer: Administrative expenses; Post-employment benefit expense in profit or loss, defined benefit plans] [Contrast: Increase (decrease) in net defined benefit liability (asset) resulting from administration costs not reflected in return on plan assets; Return on plan assets excluding interest income or expense, net of tax, defined benefit plans; Return on plan assets excluding interest income or expense, before tax, defined benefit plans] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2023-01-01 -Paragraph 135 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_135_b&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The expense of employee service in the current period arising from defined benefit plans. [Refer: Post-employment benefit expense in profit or loss, defined benefit plans] [Contrast: Increase in net defined benefit liability (asset) resulting from current service cost] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2023-01-01 -Paragraph 135 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_135_b&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The amount of expense (income) resulting from past service cost and losses (gains) arising from settlements. [Refer: Post-employment benefit expense in profit or loss, defined benefit plans; Past service cost, defined benefit plans] [Contrast: Increase (decrease) in net defined benefit liability (asset) resulting from past service cost and losses (gains) arising from settlements] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2023-01-01 -Paragraph 135 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_135_b&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The amount of post-employment benefit expense included in profit or loss relating to defined benefit plans. [Refer: Profit (loss); Defined benefit plans [member]] [Contrast: Increase (decrease) in net defined benefit liability (asset) resulting from expense (income) in profit or loss] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2023-01-01 -Paragraph 5 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_5&doctype=Standard -URIDate 2023-03-23 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2023-01-01 -Paragraph 135 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_135_b&doctype=Standard -URIDate 2023-03-23 + Details
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