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Provisions, income tax liabilities and other liabilities - Service Cost for Pension and Other post-employment Benefit Plans, by Geographical Region (Details) - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
France |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |
Remeasurement of net defined-benefit (asset)/ liability (actuarial gains and losses) |  | € 29 | € (3) | € 156
Germany |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |
Remeasurement of net defined-benefit (asset)/ liability (actuarial gains and losses) |  | 135 | (98) | 205
US |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |
Remeasurement of net defined-benefit (asset)/ liability (actuarial gains and losses) |  | 47 | (25) | 382
UK |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |
Remeasurement of net defined-benefit (asset)/ liability (actuarial gains and losses) |  | (212) | (44) | (131)
Pensions and other post-employment benefits |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |
Current service cost | [1] | 138 | 140 | 193
(Gains)/losses related to plan amendments, curtailments or settlements not specified in the terms of the plan |  | (110) | (22) | (68)
Net interest cost/(income) including administration costs and taxes paid during the period |  | 77 | 78 | 49
Contributions from plan members | [1] | (5) | (6) | (6)
Expense/(gain) recognized directly in profit or loss | [1] | 100 | 190 | 168
Remeasurement of net defined-benefit (asset)/ liability (actuarial gains and losses) | [1],[2] | (13) | 171 | (650)
Expense/(gain) for the period |  | 87 | 361 | (482)
Pensions and other post-employment benefits | France |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |
Current service cost |  | 48 | 50 | 61
(Gains)/losses related to plan amendments, curtailments or settlements not specified in the terms of the plan |  | (82) | (20) | (60)
Net interest cost/(income) including administration costs and taxes paid during the period |  | 13 | 22 | 10
Contributions from plan members |  | 0 | 0 | 0
Expense/(gain) recognized directly in profit or loss |  | (21) | 52 | 11
Remeasurement of net defined-benefit (asset)/ liability (actuarial gains and losses) |  | (31) | 3 | (156)
Expense/(gain) for the period |  | (52) | 55 | (145)
Pensions and other post-employment benefits | Germany |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |
Current service cost |  | 30 | 30 | 44
(Gains)/losses related to plan amendments, curtailments or settlements not specified in the terms of the plan |  | 0 | 0 | 2
Net interest cost/(income) including administration costs and taxes paid during the period |  | 20 | 15 | 7
Contributions from plan members |  | 0 | 0 | 0
Expense/(gain) recognized directly in profit or loss |  | 50 | 45 | 53
Remeasurement of net defined-benefit (asset)/ liability (actuarial gains and losses) |  | (134) | 98 | (204)
Expense/(gain) for the period |  | (84) | 143 | (151)
Pensions and other post-employment benefits | US |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |
Current service cost |  | 22 | 20 | 50
(Gains)/losses related to plan amendments, curtailments or settlements not specified in the terms of the plan |  | (20) | 1 | 1
Net interest cost/(income) including administration costs and taxes paid during the period |  | 36 | 35 | 30
Contributions from plan members |  | 0 | 0 | 0
Expense/(gain) recognized directly in profit or loss |  | 38 | 56 | 81
Remeasurement of net defined-benefit (asset)/ liability (actuarial gains and losses) |  | (46) | 26 | (382)
Expense/(gain) for the period |  | (8) | 82 | (301)
Pensions and other post-employment benefits | UK |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |
Current service cost |  | 0 | 0 | 0
(Gains)/losses related to plan amendments, curtailments or settlements not specified in the terms of the plan |  | 0 | 0 | (6)
Net interest cost/(income) including administration costs and taxes paid during the period |  | (1) | (5) | (7)
Contributions from plan members |  | 0 | 0 | 0
Expense/(gain) recognized directly in profit or loss |  | (1) | (5) | (13)
Remeasurement of net defined-benefit (asset)/ liability (actuarial gains and losses) |  | 212 | 44 | 130
Expense/(gain) for the period |  | 211 | 39 | 117
Pensions and other post-employment benefits | Other |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |
Current service cost |  | 38 | 40 | 38
(Gains)/losses related to plan amendments, curtailments or settlements not specified in the terms of the plan |  | (8) | (3) | (5)
Net interest cost/(income) including administration costs and taxes paid during the period |  | 9 | 11 | 9
Contributions from plan members |  | (5) | (6) | (6)
Expense/(gain) recognized directly in profit or loss |  | 34 | 42 | 36
Remeasurement of net defined-benefit (asset)/ liability (actuarial gains and losses) |  | (14) | 0 | (38)
Expense/(gain) for the period |  | € 20 | € 42 | € (2)
[1] | (d) Benefit cost for the total Group including Opella on all the periods
[2] | (b)Amounts recognized in Other comprehensive income (see Note D.15.7.).

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- Definition The decrease (increase) in the net defined benefit liability (asset) resulting from contributions to a defined benefit plan by plan participants. [Refer: Net defined benefit liability (asset); Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2023-01-01 -Paragraph 141 -Subparagraph f -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_141_f&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The increase (decrease) in the net defined benefit liability (asset) resulting from employee service in the current period. [Refer: Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2023-01-01 -Paragraph 141 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_141_a&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table. + References No definition available. + Details
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- Definition The decrease (increase) in a net defined benefit liability (asset) resulting from the remeasurement of that net defined benefit liability (asset). [Refer: Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2023-01-01 -Paragraph 141 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_141_c&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition Expense/(gain) for the period. + References No definition available. + Details
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- Definition Interest Expense (Income) Including Administration Costs And Taxes Paid, Net Defined Benefit Liability (Asset) + References No definition available. + Details
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- Definition Total expense for pensions and other post-employment benefits recognized directly in profit or loss. + References No definition available. + Details
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