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Provisions, income tax liabilities and other liabilities - Summary of Present Value of Pension and Other Post Employment Benefits (Details) - Pensions and other post-employment benefits - EUR (€) € in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
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Disclosure of net defined benefit liability (asset) [line items] |  |  |  |
Net defined benefit liability (asset) | € 1,943 | € 1,770 | € 2,539 |
Present value of defined benefit obligation |  |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |  |
Net defined benefit liability (asset) | 8,930 | 8,651 | 12,175 | € 12,456
Wholly or partly funded defined benefit plans | Present value of defined benefit obligation |  |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |  |
Net defined benefit liability (asset) | 7,693 | 7,463 | 10,416 |
Wholly unfunded defined benefit plans | Present value of defined benefit obligation |  |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |  |
Net defined benefit liability (asset) | € 1,237 | € 1,188 | € 1,759 |

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- Definition The amount of deficit or surplus in a defined benefit plan, adjusted for any effect of limiting a net defined benefit asset to the asset ceiling. [Refer: Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2023-01-01 -Paragraph 140 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_140_a&doctype=Standard -URIDate 2023-03-23 + Details
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