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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, 2023 | Dec. 31, 2022 | Dec. 31, 2021
France |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Remeasurement of net defined-benefit (asset)/ liability (actuarial gains and losses) | € (3) | € 156 | € 106
Germany |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Remeasurement of net defined-benefit (asset)/ liability (actuarial gains and losses) | (98) | 205 | 113
US |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Remeasurement of net defined-benefit (asset)/ liability (actuarial gains and losses) | (25) | 382 | 156
UK |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Remeasurement of net defined-benefit (asset)/ liability (actuarial gains and losses) | (44) | (131) | 237
Pensions and other post-employment benefits |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Current service cost | 140 | 193 | 227
(Gains)/losses related to plan amendments, curtailments or settlements not specified in the terms of the plan | (22) | (68) | 5
Net interest cost/(income) including administration costs and taxes paid during the period | 78 | 49 | 49
Contributions from plan members | (6) | (6) | (6)
Expense/(gain) recognized directly in profit or loss | 190 | 168 | 276
Remeasurement of net defined-benefit (asset)/ liability (actuarial gains and losses) | 171 | (650) | (685)
Expense/(gain) for the period | 361 | (482) | (409)
Pensions and other post-employment benefits | France |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Current service cost | 50 | 61 | 72
(Gains)/losses related to plan amendments, curtailments or settlements not specified in the terms of the plan | (20) | (60) | 2
Net interest cost/(income) including administration costs and taxes paid during the period | 22 | 10 | 5
Contributions from plan members | 0 | 0 | 0
Expense/(gain) recognized directly in profit or loss | 52 | 11 | 80
Remeasurement of net defined-benefit (asset)/ liability (actuarial gains and losses) | 3 | (156) | (106)
Expense/(gain) for the period | 55 | (145) | (26)
Pensions and other post-employment benefits | Germany |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Current service cost | 30 | 44 | 47
(Gains)/losses related to plan amendments, curtailments or settlements not specified in the terms of the plan | 0 | 2 | 0
Net interest cost/(income) including administration costs and taxes paid during the period | 15 | 7 | 5
Contributions from plan members | 0 | 0 | 0
Expense/(gain) recognized directly in profit or loss | 45 | 53 | 52
Remeasurement of net defined-benefit (asset)/ liability (actuarial gains and losses) | 98 | (204) | (113)
Expense/(gain) for the period | 143 | (151) | (61)
Pensions and other post-employment benefits | US |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Current service cost | 20 | 50 | 57
(Gains)/losses related to plan amendments, curtailments or settlements not specified in the terms of the plan | 1 | 1 | 0
Net interest cost/(income) including administration costs and taxes paid during the period | 35 | 30 | 27
Contributions from plan members | 0 | 0 | 0
Expense/(gain) recognized directly in profit or loss | 56 | 81 | 84
Remeasurement of net defined-benefit (asset)/ liability (actuarial gains and losses) | 26 | (382) | (157)
Expense/(gain) for the period | 82 | (301) | (73)
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 | (6) | 3
Net interest cost/(income) including administration costs and taxes paid during the period | (5) | (7) | 3
Contributions from plan members | 0 | 0 | 0
Expense/(gain) recognized directly in profit or loss | (5) | (13) | 6
Remeasurement of net defined-benefit (asset)/ liability (actuarial gains and losses) | 44 | 130 | (236)
Expense/(gain) for the period | 39 | 117 | (230)
Pensions and other post-employment benefits | Other |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Current service cost | 40 | 38 | 51
(Gains)/losses related to plan amendments, curtailments or settlements not specified in the terms of the plan | (3) | (5) | 0
Net interest cost/(income) including administration costs and taxes paid during the period | 11 | 9 | 9
Contributions from plan members | (6) | (6) | (6)
Expense/(gain) recognized directly in profit or loss | 42 | 36 | 54
Remeasurement of net defined-benefit (asset)/ liability (actuarial gains and losses) | 0 | (38) | (73)
Expense/(gain) for the period | € 42 | € (2) | € (19)

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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 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 Total expense for pensions and other post-employment benefits recognized directly in profit or loss. + References No definition available. + Details
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