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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
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Dec. 31, 2022 | Dec. 31, 2021
Disclosure Of Liability Asset Of Benefit Plans [Line Items] |  |
Net benefit liability (asset) at beginning of year | € 819 |
Net benefit liability (asset) at end of year | 786 | € 819
Other benefit plans |  |
Disclosure Of Liability Asset Of Benefit Plans [Line Items] |  |
Net benefit liability (asset) at beginning of year | 301 |
Net benefit liability (asset) at end of year | 341 | 301
Defined benefit plan |  |
Disclosure Of Liability Asset Of Benefit Plans [Line Items] |  |
Net benefit liability (asset) at beginning of year | 518 |
Net benefit liability (asset) at end of year | 445 | 518
Italian defined benefit plans |  |
Disclosure Of Liability Asset Of Benefit Plans [Line Items] |  |
Net benefit liability (asset) at beginning of year | 227 |
Net benefit liability (asset) at end of year | 177 | 227
Foreign defined benefit plan |  |
Disclosure Of Liability Asset Of Benefit Plans [Line Items] |  |
Net benefit liability (asset) at beginning of year | 129 |
Net benefit liability (asset) at end of year | 142 | 129
FISDE and other foreign medical plans |  |
Disclosure Of Liability Asset Of Benefit Plans [Line Items] |  |
Net benefit liability (asset) at beginning of year | 162 |
Net benefit liability (asset) at end of year | 126 | 162
Present value of benefit liabilities |  |
Disclosure Of Liability Asset Of Benefit Plans [Line Items] |  |
Net defined benefit liability (asset) at beginning of year | 1,451 | 1,848
Current service cost | 67 | 69
Interest cost/income | 29 | 26
Remeasurements: | (199) | (135)
- actuarial (gains) losses due to changes in demographic assumptions | 7 | (9)
- actuarial (gains) losses due to changes in financial assumptions | (228) | (107)
- experience (gains) losses | 22 | (19)
Past service cost and (gains) losses settlements | 127 | 107
Plan contributions: | 1 | 1
- employee contributions | 1 | 1
Benefits paid | (153) | (139)
Currency translation differences and other changes | (35) | (326)
Net defined benefit liability (asset) at end of year | 1,288 | 1,451
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 | 301 | 268
Current service cost | 52 | 49
Interest cost/income | 1 |
Remeasurements: | (22) | (11)
- actuarial (gains) losses due to changes in demographic assumptions | (2) | (1)
- actuarial (gains) losses due to changes in financial assumptions | (15) | 2
- experience (gains) losses | (5) | (12)
Past service cost and (gains) losses settlements | 127 | 107
Benefits paid | (87) | (56)
Currency translation differences and other changes | (31) | (56)
Net defined benefit liability (asset) at end of year | 341 | 301
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 | 1,150 | 1,580
Current service cost | 15 | 20
Interest cost/income | 28 | 26
Remeasurements: | (177) | (124)
- actuarial (gains) losses due to changes in demographic assumptions | 9 | (8)
- actuarial (gains) losses due to changes in financial assumptions | (213) | (109)
- experience (gains) losses | 27 | (7)
Plan contributions: | 1 | 1
- employee contributions | 1 | 1
Benefits paid | (66) | (83)
Currency translation differences and other changes | (4) | (270)
Net defined benefit liability (asset) at end of year | 947 | 1,150
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 | 227 | 258
Current service cost | 1 | 1
Interest cost/income | 2 | 1
Remeasurements: | (26) |
- actuarial (gains) losses due to changes in demographic assumptions |  | (1)
- actuarial (gains) losses due to changes in financial assumptions | (34) | (1)
- experience (gains) losses | 8 | 2
Benefits paid | (28) | (36)
Currency translation differences and other changes | 1 | 3
Net defined benefit liability (asset) at end of year | 177 | 227
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 | 761 | 1,140
Current service cost | 11 | 16
Interest cost/income | 24 | 24
Remeasurements: | (118) | (118)
- actuarial (gains) losses due to changes in demographic assumptions | 9 | (3)
- actuarial (gains) losses due to changes in financial assumptions | (144) | (111)
- experience (gains) losses | 17 | (4)
Plan contributions: | 1 | 1
- employee contributions | 1 | 1
Benefits paid | (30) | (39)
Currency translation differences and other changes | (5) | (263)
Net defined benefit liability (asset) at end of year | 644 | 761
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 | 162 | 182
Current service cost | 3 | 3
Interest cost/income | 2 | 1
Remeasurements: | (33) | (6)
- actuarial (gains) losses due to changes in demographic assumptions |  | (4)
- actuarial (gains) losses due to changes in financial assumptions | (35) | 3
- experience (gains) losses | 2 | (5)
Benefits paid | (8) | (8)
Currency translation differences and other changes |  | (10)
Net defined benefit liability (asset) at end of year | 126 | 162
Plan assets |  |
Disclosure Of Liability Asset Of Benefit Plans [Line Items] |  |
Net benefit liability (asset) at beginning of year | 633 | 648
Interest cost/income | 18 | 12
Return on plan assets | (117) | (5)
Past service cost and (gains) losses settlements | (1) |
Plan contributions: | 14 | 15
- employee contributions | 1 | 1
- employer contributions | 13 | 14
Benefits paid | (21) | (28)
Currency translation differences and other changes | (23) | (9)
Net benefit liability (asset) at end of year | 503 | 633
Plan assets | Defined benefit plan |  |
Disclosure Of Liability Asset Of Benefit Plans [Line Items] |  |
Net benefit liability (asset) at beginning of year | 633 | 648
Interest cost/income | 18 | 12
Return on plan assets | (117) | (5)
Past service cost and (gains) losses settlements | (1) |
Plan contributions: | 14 | 15
- employee contributions | 1 | 1
- employer contributions | 13 | 14
Benefits paid | (21) | (28)
Currency translation differences and other changes | (23) | (9)
Net benefit liability (asset) at end of year | 503 | 633
Plan assets | Foreign defined benefit plan |  |
Disclosure Of Liability Asset Of Benefit Plans [Line Items] |  |
Net benefit liability (asset) at beginning of year | 633 | 648
Interest cost/income | 18 | 12
Return on plan assets | (117) | (5)
Past service cost and (gains) losses settlements | (1) |
Plan contributions: | 14 | 15
- employee contributions | 1 | 1
- employer contributions | 13 | 14
Benefits paid | (21) | (28)
Currency translation differences and other changes | (23) | (9)
Net benefit liability (asset) at end of year | 503 | 633
Asset ceiling |  |
Disclosure Of Liability Asset Of Benefit Plans [Line Items] |  |
Net benefit liability (asset) at beginning of year | 1 | 1
Net benefit liability (asset) at end of year | 1 | 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
Net benefit liability (asset) at end of year | 1 | 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
Net benefit liability (asset) at end of year | € 1 | € 1

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- Definition The amount of contributions to plan by plan participants for net benefit liability (asset). + References No definition available. + Details
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- Definition The amount of increase decrease through changes in foreign exchange rates and other changes net benefit liability asset. + References No definition available. + Details
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- Definition Represent the Increase decrease through changes in foreign exchange rates and other changes net defined benefit liability asset. + 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 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 2022-03-24 -Paragraph 141 -Subparagraph c -Clause ii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2022-en-r&anchor=para_141_c_ii&doctype=Standard -URIDate 2022-03-24 + 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 2022-03-24 -Paragraph 141 -Subparagraph c -Clause iii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2022-en-r&anchor=para_141_c_iii&doctype=Standard -URIDate 2022-03-24 + 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 2022-03-24 -Paragraph 141 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2022-en-r&anchor=para_141_c&doctype=Standard -URIDate 2022-03-24 + 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 2022-03-24 -Paragraph 141 -Subparagraph f -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2022-en-r&anchor=para_141_f&doctype=Standard -URIDate 2022-03-24 + 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 2022-03-24 -Paragraph 141 -Subparagraph f -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2022-en-r&anchor=para_141_f&doctype=Standard -URIDate 2022-03-24 + 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 2022-03-24 -Paragraph 141 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2022-en-r&anchor=para_141_a&doctype=Standard -URIDate 2022-03-24 + 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 2022-03-24 -Paragraph 140 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2022-en-r&anchor=para_140_a&doctype=Standard -URIDate 2022-03-24 + Details
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