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Provisions for employee benefits - Actuarial assumptions used in the measurement of the liabilities (Details) | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Other benefit plans |  |
Statement |  |
Rate of price inflation | 1.80% | 0.80%
Other benefit plans | Minimum |  |
Statement |  |
Discount rate | 0.00% | 0.00%
Other benefit plans | Maximum |  |
Statement |  |
Discount rate | 1.00% | 0.30%
Italian defined benefit plans |  |
Statement |  |
Discount rate | 1.00% | 0.30%
Rate of compensation increase | 2.80% | 1.80%
Rate of price inflation | 1.80% | 0.80%
Foreign defined benefit plan | Minimum |  |
Statement |  |
Discount rate | 0.30% | 0.10%
Rate of compensation increase | 1.50% | 1.30%
Rate of price inflation | 0.70% | 0.80%
Life expectations on retirement at age 65 | 13 years | 13 years
Foreign defined benefit plan | Maximum |  |
Statement |  |
Discount rate | 15.30% | 14.70%
Rate of compensation increase | 12.50% | 12.50%
Rate of price inflation | 13.30% | 12.20%
Life expectations on retirement at age 65 | 25 years | 26 years
FISDE and other foreign medical plans |  |
Statement |  |
Discount rate | 1.00% | 0.30%
Rate of price inflation | 1.80% | 0.80%
Life expectations on retirement at age 65 | 24 years | 24 years

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- Definition The discount rate used as the significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit obligation, at present value; Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2021-01-01 -Paragraph 144 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2021-en-r&anchor=para_144&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The expected rate of inflation that is used as a significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit plans [member]; Defined benefit obligation, at present value; Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2021-01-01 -Paragraph 144 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2021-en-r&anchor=para_144&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The expected rate of salary increases used as a significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit plans [member]; Defined benefit obligation, at present value; Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2021-01-01 -Paragraph 144 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2021-en-r&anchor=para_144&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The life expectancy after retirement used as a significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit obligation, at present value; Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2021-01-01 -Paragraph 144 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2021-en-r&anchor=para_144&doctype=Standard -URIDate 2021-03-24 + Details
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