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Provisions, income tax liabilities and other liabilities - Summary of Financial and Demographic Assumptions (Details) | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Disclosure of defined benefit plans [line items] |  |  |
Weighted average duration of defined benefit obligation | 10 years |  |
Minimum Plan 1 |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Weighted average duration of defined benefit obligation | 0 years |  |
Maximum Plan 1 |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Weighted average duration of defined benefit obligation | 7 years |  |
Minimum plan 2 |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Weighted average duration of defined benefit obligation | 7 years |  |
Maximum plan 2 |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Weighted average duration of defined benefit obligation | 10 years |  |
France |  |  |
Disclosure of defined benefit plans [line items] |  |  |
General inflation rate | 2.20% | 2.50% | 1.95%
Pension benefit indexation | 2.20% | 2.50% |
Weighted average duration of defined benefit obligation | 10 years | 10 years | 12 years
France | Bottom of range |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Discount rate | 2.95% | 3.55% | 0.10%
Pension benefit indexation |  |  | 1.95%
Retirement age | 62 years | 62 years | 62 years
France | Top of range |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Discount rate | 3.15% | 3.75% | 1.10%
Retirement age | 67 years | 67 years | 67 years
Germany |  |  |
Disclosure of defined benefit plans [line items] |  |  |
General inflation rate | 2.20% | 2.50% | 1.95%
Pension benefit indexation | 2.20% | 2.50% | 1.95%
Retirement age | 63 years | 63 years | 62 years
Weighted average duration of defined benefit obligation | 12 years | 12 years | 16 years
Germany | Bottom of range |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Discount rate | 2.95% | 3.55% | 0.10%
Germany | Top of range |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Discount rate | 3.15% | 3.75% | 1.10%
US |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Discount rate | 4.75% | 4.90% | 2.70%
Weighted average duration of defined benefit obligation | 11 years | 11 years | 15 years
US | Bottom of range |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Healthcare cost inflation rate | 4.00% | 3.29% | 3.50%
Retirement age | 55 years | 55 years | 55 years
US | Top of range |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Healthcare cost inflation rate | 9.75% | 6.56% | 4.50%
Retirement age | 70 years | 70 years | 70 years
UK |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Discount rate | 4.50% | 4.75% | 1.90%
General inflation rate | 3.05% | 3.25% | 3.30%
Pension benefit indexation | 2.90% | 3.00% | 3.15%
Weighted average duration of defined benefit obligation | 13 years | 13 years | 17 years
UK | Bottom of range |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Retirement age | 60 years | 60 years | 60 years
UK | Top of range |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Retirement age | 65 years | 65 years | 65 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 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 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 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 increases in pension 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 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 Medical cost trend rate used as 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 retirement age 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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- Definition The weighted average duration of a defined benefit obligation. [Refer: Weighted average [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2023-01-01 -Paragraph 147 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_147_c&doctype=Standard -URIDate 2023-03-23 + Details
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