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Provisions for employee benefits - Present value of employee benefits, estimated by applying actuarial techniques (Details) - EUR (€) € in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Disclosure Of Liability Asset Of Benefit Plans [Line Items] |  |
Net benefit liability (asset) at beginning of year | € 786 |
Net benefit liability (asset) at end of year | 748 | € 786
Other benefit plans |  |
Disclosure Of Liability Asset Of Benefit Plans [Line Items] |  |
Net benefit liability (asset) at beginning of year | 341 |
Net benefit liability (asset) at end of year | 353 | 341
Defined benefit plan |  |
Disclosure Of Liability Asset Of Benefit Plans [Line Items] |  |
Net benefit liability (asset) at beginning of year | 445 |
Net benefit liability (asset) at end of year | 395 | 445
Italian defined benefit plans |  |
Disclosure Of Liability Asset Of Benefit Plans [Line Items] |  |
Net benefit liability (asset) at beginning of year | 177 |
Net benefit liability (asset) at end of year | 156 | 177
Foreign defined benefit plan |  |
Disclosure Of Liability Asset Of Benefit Plans [Line Items] |  |
Net benefit liability (asset) at beginning of year | 142 |
Net benefit liability (asset) at end of year | 121 | 142
FISDE and other foreign medical plans |  |
Disclosure Of Liability Asset Of Benefit Plans [Line Items] |  |
Net benefit liability (asset) at beginning of year | 126 |
Net benefit liability (asset) at end of year | 118 | 126
Present value of benefit liabilities |  |
Disclosure Of Liability Asset Of Benefit Plans [Line Items] |  |
Net defined benefit liability (asset) at beginning of year | 1,288 | 1,451
Current service cost | 64 | 67
Interest cost/income | 49 | 29
Remeasurements: | 28 | (199)
- actuarial (gains) losses due to changes in demographic assumptions | 1 | 7
- actuarial (gains) losses due to changes in financial assumptions | 15 | (228)
- experience (gains) losses | 12 | 22
Past service cost and (gains) losses settlements | 84 | 127
Plan contributions: | 1 | 1
- employee contributions | 1 | 1
Benefits paid | (182) | (153)
Reclassification to liabilities directly associated with assets held for sale | (155) | (4)
Currency translation differences and other changes | (170) | (31)
Net defined benefit liability (asset) at end of year | 1,007 | 1,288
Present value of benefit liabilities | Other benefit plans |  |
Disclosure Of Liability Asset Of Benefit Plans [Line Items] |  |
Net defined benefit liability (asset) at beginning of year | 341 | 301
Current service cost | 51 | 52
Interest cost/income | 10 | 1
Remeasurements: | (2) | (22)
- actuarial (gains) losses due to changes in demographic assumptions | (1) | (2)
- actuarial (gains) losses due to changes in financial assumptions | 1 | (15)
- experience (gains) losses | (2) | (5)
Past service cost and (gains) losses settlements | 91 | 127
Benefits paid | (97) | (87)
Reclassification to liabilities directly associated with assets held for sale | (2) |
Currency translation differences and other changes | (39) | (31)
Net defined benefit liability (asset) at end of year | 353 | 341
Present value of benefit liabilities | Defined benefit plan |  |
Disclosure Of Liability Asset Of Benefit Plans [Line Items] |  |
Net defined benefit liability (asset) at beginning of year | 947 | 1,150
Current service cost | 13 | 15
Interest cost/income | 39 | 28
Remeasurements: | 30 | (177)
- actuarial (gains) losses due to changes in demographic assumptions | 2 | 9
- actuarial (gains) losses due to changes in financial assumptions | 14 | (213)
- experience (gains) losses | 14 | 27
Past service cost and (gains) losses settlements | (7) |
Plan contributions: | 1 | 1
- employee contributions | 1 | 1
Benefits paid | (85) | (66)
Reclassification to liabilities directly associated with assets held for sale | (153) | (4)
Currency translation differences and other changes | (131) |
Net defined benefit liability (asset) at end of year | 654 | 947
Present value of benefit liabilities | Italian defined benefit plans |  |
Disclosure Of Liability Asset Of Benefit Plans [Line Items] |  |
Net defined benefit liability (asset) at beginning of year | 177 | 227
Current service cost | 1 | 1
Interest cost/income | 6 | 2
Remeasurements: | 5 | (26)
- actuarial (gains) losses due to changes in demographic assumptions | 1 |
- actuarial (gains) losses due to changes in financial assumptions | 4 | (34)
- experience (gains) losses |  | 8
Past service cost and (gains) losses settlements | 2 |
Benefits paid | (37) | (28)
Currency translation differences and other changes | 2 | 1
Net defined benefit liability (asset) at end of year | 156 | 177
Present value of benefit liabilities | Foreign defined benefit plan |  |
Disclosure Of Liability Asset Of Benefit Plans [Line Items] |  |
Net defined benefit liability (asset) at beginning of year | 644 | 761
Current service cost | 10 | 11
Interest cost/income | 29 | 24
Remeasurements: | 24 | (118)
- actuarial (gains) losses due to changes in demographic assumptions | 1 | 9
- actuarial (gains) losses due to changes in financial assumptions | 8 | (144)
- experience (gains) losses | 15 | 17
Past service cost and (gains) losses settlements | (13) |
Plan contributions: | 1 | 1
- employee contributions | 1 | 1
Benefits paid | (39) | (30)
Reclassification to liabilities directly associated with assets held for sale | (147) | (2)
Currency translation differences and other changes | (129) | (3)
Net defined benefit liability (asset) at end of year | 380 | 644
Present value of benefit liabilities | FISDE and other foreign medical plans |  |
Disclosure Of Liability Asset Of Benefit Plans [Line Items] |  |
Net defined benefit liability (asset) at beginning of year | 126 | 162
Current service cost | 2 | 3
Interest cost/income | 4 | 2
Remeasurements: | 1 | (33)
- actuarial (gains) losses due to changes in financial assumptions | 2 | (35)
- experience (gains) losses | (1) | 2
Past service cost and (gains) losses settlements | 4 |
Benefits paid | (9) | (8)
Reclassification to liabilities directly associated with assets held for sale | (6) | (2)
Currency translation differences and other changes | (4) | 2
Net defined benefit liability (asset) at end of year | 118 | 126
Plan assets |  |
Disclosure Of Liability Asset Of Benefit Plans [Line Items] |  |
Net benefit liability (asset) at beginning of year | 503 | 633
Interest cost/income | 19 | 18
Return on plan assets |  | (117)
Past service cost and (gains) losses settlements |  | (1)
Plan contributions: | 25 | 14
- employee contributions | 1 | 1
- employer contributions | 24 | 13
Benefits paid | (31) | (21)
Currency translation differences and other changes | (132) | (23)
Reclassification to liabilities directly associated with assets held for sale | (123) |
Net benefit liability (asset) at end of year | 261 | 503
Plan assets | Defined benefit plan |  |
Disclosure Of Liability Asset Of Benefit Plans [Line Items] |  |
Net benefit liability (asset) at beginning of year | 503 | 633
Interest cost/income | 19 | 18
Return on plan assets |  | (117)
Past service cost and (gains) losses settlements |  | (1)
Plan contributions: | 25 | 14
- employee contributions | 1 | 1
- employer contributions | 24 | 13
Benefits paid | (31) | (21)
Currency translation differences and other changes | (132) | (23)
Reclassification to liabilities directly associated with assets held for sale | (123) |
Net benefit liability (asset) at end of year | 261 | 503
Plan assets | Foreign defined benefit plan |  |
Disclosure Of Liability Asset Of Benefit Plans [Line Items] |  |
Net defined benefit liability (asset) at beginning of year | 503 |
Net defined benefit liability (asset) at end of year |  | 503
Net benefit liability (asset) at beginning of year | 503 | 633
Interest cost/income | 19 | 18
Return on plan assets |  | (117)
Past service cost and (gains) losses settlements |  | (1)
Plan contributions: | 25 | 14
- employee contributions | 1 | 1
- employer contributions | 24 | 13
Benefits paid | (31) | (21)
Currency translation differences and other changes | (132) | (23)
Reclassification to liabilities directly associated with assets held for sale | (123) |
Net benefit liability (asset) at end of year | 261 | 503
Asset ceiling |  |
Disclosure Of Liability Asset Of Benefit Plans [Line Items] |  |
Net benefit liability (asset) at beginning of year | 1 | 1
Change in asset ceiling | 1 |
Net benefit liability (asset) at end of year | 2 | 1
Asset ceiling | Defined benefit plan |  |
Disclosure Of Liability Asset Of Benefit Plans [Line Items] |  |
Net benefit liability (asset) at beginning of year | 1 | 1
Change in asset ceiling | 1 |
Net benefit liability (asset) at end of year | 2 | 1
Asset ceiling | Foreign defined benefit plan |  |
Disclosure Of Liability Asset Of Benefit Plans [Line Items] |  |
Net benefit liability (asset) at beginning of year | 1 | 1
Change in asset ceiling | 1 |
Net benefit liability (asset) at end of year | € 2 | € 1

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- Definition The increase (decrease) in the net benefit liability (asset) resulting from reclassification to liabilities directly associated with assets held for sale. + References No definition available. + Details
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- Definition The increase (decrease) in the net defined benefit liability (asset) resulting from reclassification to liabilities directly associated with assets held for sale. + References No definition available. + Details
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- Definition The amount of interest expense (income) for net benefit liability (asset). + References No definition available. + Details
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- Definition The amount of liability (asset) of benefit plans. + References No definition available. + Details
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- Definition The amount of past service cost and gains (losses) arising from settlements for net benefit liability (asset). + References No definition available. + Details
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- Definition The amount of payments from plan for net benefit liability (asset). + References No definition available. + Details
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- Definition The amount of return on plan assets for net benefit liability (asset). + References No definition available. + Details
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- Definition The decrease (increase) in a net defined benefit liability (asset) resulting from actuarial gains (losses) arising from changes in demographic assumptions that result in remeasurements of the net defined benefit liability (asset). Demographic assumptions deal with matters such as: (a) mortality; (b) rates of employee turnover, disability and early retirement; (c) the proportion of plan members with dependants who will be eligible for benefits; (d) the proportion of plan members who will select each form of payment option available under the plan terms; and (e) claim rates under medical plans. [Refer: Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2023-01-01 -Paragraph 141 -Subparagraph c -Clause ii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_141_c_ii&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The decrease (increase) in a net defined benefit liability (asset) resulting from actuarial gains (losses) arising from changes in financial assumptions that result in remeasurements of the net defined benefit liability (asset). Financial assumptions deal with items such as: (a) the discount rate; (b) benefit levels, excluding any cost of the benefits to be met by employees, and future salary; (c) in the case of medical benefits, future medical costs, including claim handling costs (ie the costs that will be incurred in processing and resolving claims, including legal and adjuster's fees); and (d) taxes payable by the plan on contributions relating to service before the reporting date or on benefits resulting from that service. [Refer: Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2023-01-01 -Paragraph 141 -Subparagraph c -Clause iii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_141_c_iii&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The decrease (increase) in a net defined benefit liability (asset) resulting from actuarial gains (losses) arising from experience adjustments that result in remeasurements of the net defined benefit liability (asset). Experience adjustments deal with the effects of differences between the previous actuarial assumptions and what has actually occurred. [Refer: Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2023-01-01 -Paragraph 141 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_141_c&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The decrease (increase) in the net defined benefit liability (asset) resulting from contributions to a defined benefit plan by plan participants. [Refer: Net defined benefit liability (asset); Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2023-01-01 -Paragraph 141 -Subparagraph f -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_141_f&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The decrease (increase) in the net defined benefit liability (asset) resulting from contributions to a defined benefit plan. [Refer: Net defined benefit liability (asset); Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2023-01-01 -Paragraph 141 -Subparagraph f -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_141_f&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The increase (decrease) in the net defined benefit liability (asset) resulting from employee service in the current period. [Refer: Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2023-01-01 -Paragraph 141 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_141_a&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The amount of deficit or surplus in a defined benefit plan, adjusted for any effect of limiting a net defined benefit asset to the asset ceiling. [Refer: Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2023-01-01 -Paragraph 140 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_140_a&doctype=Standard -URIDate 2023-03-23 + Details
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