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Provisions for employee benefits - Analysis by geographical area related to the main actuarial assumptions (Details) - Foreign defined benefit plan | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Minimum |  |
Statement |  |
Discount rate | 0.10% | 0.00%
Rate of compensation increase | 1.30% | 1.30%
Rate of price inflation | 0.80% | 0.80%
Life expectations on retirement at age 65 | 13 years | 13 years
Maximum |  |
Statement |  |
Discount rate | 14.70% | 13.70%
Rate of compensation increase | 12.50% | 12.50%
Rate of price inflation | 12.20% | 11.30%
Life expectations on retirement at age 65 | 26 years | 25 years
Euro Area | Minimum |  |
Statement |  |
Discount rate | 0.40% | 0.80%
Rate of compensation increase | 1.30% | 1.30%
Rate of price inflation | 1.30% | 1.30%
Life expectations on retirement at age 65 | 21 years | 21 years
Euro Area | Maximum |  |
Statement |  |
Discount rate | 0.80% | 1.00%
Rate of compensation increase | 3.00% | 3.00%
Rate of price inflation | 1.90% | 2.00%
Life expectations on retirement at age 65 | 22 years | 22 years
Rest of Europe | Minimum |  |
Statement |  |
Discount rate | 0.10% | 0.00%
Rate of compensation increase | 2.50% | 2.50%
Rate of price inflation | 0.80% | 0.80%
Life expectations on retirement at age 65 | 23 years | 24 years
Rest of Europe | Maximum |  |
Statement |  |
Discount rate | 1.40% | 2.00%
Rate of compensation increase | 3.60% | 3.60%
Rate of price inflation | 3.10% | 3.10%
Life expectations on retirement at age 65 | 26 years | 25 years
Africa | Minimum |  |
Statement |  |
Discount rate | 2.60% | 2.60%
Rate of compensation increase | 2.00% | 2.00%
Rate of price inflation | 2.60% | 2.60%
Life expectations on retirement at age 65 | 13 years | 13 years
Africa | Maximum |  |
Statement |  |
Discount rate | 14.70% | 13.70%
Rate of compensation increase | 12.50% | 12.50%
Rate of price inflation | 12.20% | 11.30%
Life expectations on retirement at age 65 | 17 years | 17 years
Other areas | Minimum |  |
Statement |  |
Discount rate | 6.40% | 7.30%
Rate of compensation increase | 5.00% | 10.00%
Rate of price inflation | 3.00% | 3.30%
Other areas | Maximum |  |
Statement |  |
Discount rate | 9.80% | 11.30%
Rate of compensation increase | 9.80% | 11.30%
Rate of price inflation | 5.00% | 5.00%

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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 2020-01-01 -Paragraph 144 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_144&doctype=Standard -URIDate 2020-01-01 + 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 2020-01-01 -Paragraph 144 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_144&doctype=Standard -URIDate 2020-01-01 + 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 2020-01-01 -Paragraph 144 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_144&doctype=Standard -URIDate 2020-01-01 + 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 2020-01-01 -Paragraph 144 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_144&doctype=Standard -URIDate 2020-01-01 + Details
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