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Provisions for employee benefits - Analysis by geographical area related to the main actuarial assumptions (Details) | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
Minimum | Foreign defined benefit plan |  |
Disclosure Of Benefit Plans [Line Items] |  |
Discount rate | 1.40% | 2.20%
Rate of compensation increase | 1.90% | 1.90%
Rate of price inflation | 1.20% | 1.20%
Life expectations on retirement at age 65 | 14 years | 13 years
Maximum | Foreign defined benefit plan |  |
Disclosure Of Benefit Plans [Line Items] |  |
Discount rate | 25.90% | 15.40%
Rate of compensation increase | 20.00% | 12.50%
Rate of price inflation | 15.50% | 11.50%
Life expectations on retirement at age 65 | 23 years | 24 years
Euro Area | Minimum |  |
Disclosure Of Benefit Plans [Line Items] |  |
Discount rate | 3.20% | 3.50%
Rate of compensation increase | 1.90% | 1.90%
Rate of price inflation | 1.90% | 1.90%
Life expectations on retirement at age 65 | 21 years | 21 years
Euro Area | Maximum |  |
Disclosure Of Benefit Plans [Line Items] |  |
Discount rate | 3.30% | 3.80%
Rate of compensation increase | 3.00% | 3.00%
Rate of price inflation | 2.10% | 2.20%
Life expectations on retirement at age 65 | 23 years | 22 years
Rest of Europe |  |
Disclosure Of Benefit Plans [Line Items] |  |
Rate of compensation increase | 3.00% |
Life expectations on retirement at age 65 | 23 years |
Rest of Europe | Minimum |  |
Disclosure Of Benefit Plans [Line Items] |  |
Discount rate | 1.40% | 2.20%
Rate of compensation increase |  | 3.00%
Rate of price inflation | 1.20% | 1.20%
Life expectations on retirement at age 65 |  | 23 years
Rest of Europe | Maximum |  |
Disclosure Of Benefit Plans [Line Items] |  |
Discount rate | 4.50% | 4.80%
Rate of compensation increase |  | 4.00%
Rate of price inflation | 3.40% | 3.50%
Life expectations on retirement at age 65 |  | 24 years
Africa | Minimum |  |
Disclosure Of Benefit Plans [Line Items] |  |
Discount rate | 3.20% | 3.80%
Rate of compensation increase | 5.00% | 1.90%
Rate of price inflation | 3.10% | 3.00%
Life expectations on retirement at age 65 | 14 years | 13 years
Africa | Maximum |  |
Disclosure Of Benefit Plans [Line Items] |  |
Discount rate | 25.90% | 15.40%
Rate of compensation increase | 20.00% | 12.50%
Rate of price inflation | 15.50% | 11.50%
Life expectations on retirement at age 65 | 18 years | 17 years
Other areas |  |
Disclosure Of Benefit Plans [Line Items] |  |
Discount rate | 6.90% | 7.00%
Rate of compensation increase | 5.00% | 5.00%
Rate of price inflation | 3.50% | 3.00%

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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 2023-01-01 -Paragraph 144 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_144&doctype=Standard -URIDate 2023-03-23 + 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 2023-01-01 -Paragraph 144 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_144&doctype=Standard -URIDate 2023-03-23 + 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 2023-01-01 -Paragraph 144 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_144&doctype=Standard -URIDate 2023-03-23 + Details
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