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Provisions for employee benefits - Effects of a possible change in the main actuarial assumptions (Details) - EUR (€) € in Millions | Dec. 31, 2022 | Dec. 31, 2021
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Disclosure Of Benefit Plans [Line Items] |  |
Percentage of reasonably possible increase in actuarial assumption | 0.50% | 0.50%
Percentage of reasonably possible decrease in actuarial assumption | 0.50% | 0.50%
Other benefit plans | Actuarial assumption of discount rates |  |
Disclosure Of Benefit Plans [Line Items] |  |
Increase (decrease) in other benefit obligation due to reasonably possible increase in actuarial assumption | € (3) | € (4)
Increase (decrease) in other benefit obligation due to reasonably possible decrease in actuarial assumption | 3 | 1
Other benefit plans | Actuarial assumption of expected rates of inflation |  |
Disclosure Of Benefit Plans [Line Items] |  |
Increase (decrease) in other benefit obligation due to reasonably possible increase in actuarial assumption | 1 | 1
Italian defined benefit plans | Actuarial assumption of discount rates |  |
Disclosure Of Benefit Plans [Line Items] |  |
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption | (6) | (9)
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption | 7 | 9
Italian defined benefit plans | Actuarial assumption of expected rates of inflation |  |
Disclosure Of Benefit Plans [Line Items] |  |
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption | 4 | 6
Foreign defined benefit plan | Actuarial assumption of discount rates |  |
Disclosure Of Benefit Plans [Line Items] |  |
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption | (33) | (49)
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption | 34 | 55
Foreign defined benefit plan | Actuarial assumption of expected rates of inflation |  |
Disclosure Of Benefit Plans [Line Items] |  |
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption | 19 | 34
Foreign defined benefit plan | Actuarial assumption of expected rates of salary increases |  |
Disclosure Of Benefit Plans [Line Items] |  |
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption | 10 | 11
Foreign defined benefit plan | Actuarial assumption of expected rates of pension increases |  |
Disclosure Of Benefit Plans [Line Items] |  |
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption | 13 | 28
FISDE and other foreign medical plans | Actuarial assumption of discount rates |  |
Disclosure Of Benefit Plans [Line Items] |  |
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption | (6) | (10)
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption | 7 | 11
FISDE and other foreign medical plans | Actuarial assumption of medical cost trend rates |  |
Disclosure Of Benefit Plans [Line Items] |  |
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption | € 6 | € 10

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- Definition The increase (decrease) in a other benefit obligation that would have been caused by a decrease in a significant actuarial assumption that was reasonably possible at the end of the reporting period. + References No definition available. + Details
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- Definition The increase (decrease) in a other benefit obligation that would have been caused by an increase in a significant actuarial assumption that was reasonably possible at the end of the reporting period. + References No definition available. + Details
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- Definition The increase (decrease) in a defined benefit obligation that would have been caused by a decrease in a significant actuarial assumption that was reasonably possible at the end of the reporting period. [Refer: Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2022-03-24 -Paragraph 145 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2022-en-r&anchor=para_145_a&doctype=Standard -URIDate 2022-03-24 + Details
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- Definition The increase (decrease) in a defined benefit obligation that would have been caused by an increase in a significant actuarial assumption that was reasonably possible at the end of the reporting period. [Refer: Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2022-03-24 -Paragraph 145 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2022-en-r&anchor=para_145_a&doctype=Standard -URIDate 2022-03-24 + Details
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