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Provisions, income tax liabilities and other liabilities - Remeasurement of Net Defined-benefit (Asset)/Liability (Actuarial Gains and Losses) (Details) - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Disclosure of defined benefit plans [line items] |  |  |  |
Gains/(losses) on financial assumptions |  | € (11) | € 168 | € (622)
France |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |
Actuarial gains/(losses) arising during the period |  | 29 | (3) | 156
Gains/(losses) on experience adjustments | [1] | 18 | 16 | (120)
Gains/(losses) on demographic assumptions |  | 0 | 0 | 0
Gains/(losses) on financial assumptions |  | 11 | (19) | 276
Germany |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |
Actuarial gains/(losses) arising during the period |  | 135 | (98) | 205
Gains/(losses) on experience adjustments | [1] | 46 | (54) | (620)
Gains/(losses) on demographic assumptions |  | 0 | 0 | 0
Gains/(losses) on financial assumptions |  | 89 | (44) | 825
US |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |
Actuarial gains/(losses) arising during the period |  | 47 | (25) | 382
Gains/(losses) on experience adjustments | [1] | (42) | (7) | (287)
Gains/(losses) on demographic assumptions |  | 11 | 18 | 129
Gains/(losses) on financial assumptions |  | 78 | (36) | 540
UK |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |
Actuarial gains/(losses) arising during the period |  | (212) | (44) | (131)
Gains/(losses) on experience adjustments | [1] | (472) | (12) | (1,328)
Gains/(losses) on demographic assumptions |  | 50 | 11 | 54
Gains/(losses) on financial assumptions |  | € 210 | € (43) | € 1,143
[1] | (a)Experience adjustments are mainly due to the effect on plan assets of trends in the financial markets

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- Definition The decrease (increase) in a net defined benefit liability (asset) resulting from actuarial gains (losses) arising from changes in demographic assumptions that result in remeasurements of the net defined benefit liability (asset). Demographic assumptions deal with matters such as: (a) mortality; (b) rates of employee turnover, disability and early retirement; (c) the proportion of plan members with dependants who will be eligible for benefits; (d) the proportion of plan members who will select each form of payment option available under the plan terms; and (e) claim rates under medical plans. [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 -Clause ii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_141_c_ii&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The decrease (increase) in a net defined benefit liability (asset) resulting from actuarial gains (losses) arising from changes in financial assumptions that result in remeasurements of the net defined benefit liability (asset). Financial assumptions deal with items such as: (a) the discount rate; (b) benefit levels, excluding any cost of the benefits to be met by employees, and future salary; (c) in the case of medical benefits, future medical costs, including claim handling costs (ie the costs that will be incurred in processing and resolving claims, including legal and adjuster's fees); and (d) taxes payable by the plan on contributions relating to service before the reporting date or on benefits resulting from that service. [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 -Clause iii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_141_c_iii&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 Actuarial gains/(losses) on experience adjustments. + References No definition available. + Details
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