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Provisions, income tax liabilities and other liabilities - Summary of Movements in Non-current Provisions (Details) - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Reconciliation of changes in other provisions [abstract] |  |  |  |
Beginning balance |  | € 5,262 | € 5,822 | € 6,430
Changes in scope of consolidation |  | 11 |  | (200)
Increases in provisions |  | 1,622 | 952 | 1,285
Provisions utilized |  | (446) | (408) | (528)
Reversals of unutilized provisions |  | (242) | (758) | (288)
Transfers |  | (516) | (572) | (274)
Net interest related to employee benefits, and unwinding of discount |  | 122 | 120 | 64
Currency translation differences |  | 116 | (65) | 113
Actuarial gains and losses on defined-benefit plans |  | (13) | 171 | (780)
Ending balance |  | 5,762 | 5,262 | 5,822
Provisions for pensions and other post-employment benefits |  |  |  |
Reconciliation of changes in other provisions [abstract] |  |  |  |
Beginning balance |  | 2,214 | 2,039 | 2,947
Changes in scope of consolidation |  | 0 |  | (96)
Increases in provisions | [1] | 145 | 141 | 193
Provisions utilized | [1] | (173) | (162) | (275)
Reversals of unutilized provisions | [1] | (108) | (21) | (66)
Transfers |  | (89) | (1) | 10
Net interest related to employee benefits, and unwinding of discount |  | 65 | 70 | 43
Currency translation differences |  | 43 | (23) | 63
Actuarial gains and losses on defined-benefit plans |  | (13) | 171 | (780)
Ending balance |  | 1,992 | 2,214 | 2,039
Provisions for other long-term benefits |  |  |  |
Reconciliation of changes in other provisions [abstract] |  |  |  |
Beginning balance |  | 718 | 844 | 935
Changes in scope of consolidation |  | 0 |  | (28)
Increases in provisions |  | 199 | 185 | 40
Provisions utilized |  | (118) | (107) | (119)
Reversals of unutilized provisions |  | 0 | (190) | (20)
Transfers |  | 0 | 0 | 4
Net interest related to employee benefits, and unwinding of discount |  | 2 | 3 | 4
Currency translation differences |  | 34 | (17) | 28
Actuarial gains and losses on defined-benefit plans |  | 0 | 0 | 0
Ending balance |  | 821 | 718 | 844
Restructuring provisions |  |  |  |
Reconciliation of changes in other provisions [abstract] |  |  |  |
Beginning balance |  | 554 | 761 | 524
Changes in scope of consolidation |  | 0 |  | 0
Increases in provisions |  | 548 | 315 | 521
Provisions utilized |  | (20) | (25) | (12)
Reversals of unutilized provisions |  | (8) | (159) | (11)
Transfers |  | (270) | (361) | (265)
Net interest related to employee benefits, and unwinding of discount |  | 19 | 23 | 5
Currency translation differences |  | (3) | 0 | (1)
Actuarial gains and losses on defined-benefit plans |  | 0 | 0 | 0
Ending balance |  | 799 | 554 | 761
Other provisions |  |  |  |
Reconciliation of changes in other provisions [abstract] |  |  |  |
Beginning balance |  | 1,776 | 2,178 | 2,024
Changes in scope of consolidation |  | 11 |  | (76)
Increases in provisions |  | 730 | 311 | 531
Provisions utilized |  | (135) | (114) | (122)
Reversals of unutilized provisions |  | (126) | (388) | (191)
Transfers |  | (157) | (210) | (23)
Net interest related to employee benefits, and unwinding of discount |  | 36 | 24 | 12
Currency translation differences |  | 42 | (25) | 23
Actuarial gains and losses on defined-benefit plans |  | 0 | 0 | 0
Ending balance |  | € 2,150 | € 1,776 | € 2,178
[1] | (a)In the case of “Provisions for pensions and other post-employment benefits”, the “Increases in provisions” line corresponds to rights vesting in employees during the period, and past service cost; the “Provisions utilized” line corresponds to contributions paid into pension funds and to beneficiaries; and the “Reversals of unutilized provisions” line corresponds to plan curtailments, settlements and amendments.

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- Definition The increase (decrease) in other provisions. [Refer: Other provisions] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 37 -IssueDate 2023-01-01 -Paragraph 84 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=37&code=ifrs-tx-2023-en-r&anchor=para_84&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The increase (decrease) in other provisions resulting from foreign currency exchange rate changes on provisions measured in a currency different from the entity's presentation currency. [Refer: Other provisions] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 37 -IssueDate 2023-01-01 -Paragraph 84 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=37&code=ifrs-tx-2023-en-r&anchor=para_84&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The increase (decrease) in other provisions resulting from transfers and changes that the entity does not separately disclose in the same statement or note. [Refer: Other provisions] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 37 -IssueDate 2023-01-01 -Paragraph 84 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=37&code=ifrs-tx-2023-en-r&anchor=para_84&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The amount of non-current provisions, including provisions for employee benefits. [Refer: Provisions] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 54 -Subparagraph l -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_54_l&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The amount used (ie incurred and charged against the provision) for other provisions. [Refer: Other provisions] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 37 -IssueDate 2023-01-01 -Paragraph 84 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=37&code=ifrs-tx-2023-en-r&anchor=para_84_c&doctype=Standard -URIDate 2023-03-23 + Details
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