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Pension and other post-employment benefits - Summary of information on plan assets and defined benefit obligation per country (Detail) - EUR (€) € in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Disclosure of net defined benefit liability (asset) [line items] |  |
Plan assets | € 2,636 | € 2,678
Defined benefit obligation | 2,219 | 2,288
Funded Status | 416 | 390
- Other assets | 568 | 554
- Other liabilities | (152) | (164)
Netherlands |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Plan assets | 325 | 331
Defined benefit obligation | 415 | 426
Funded Status | (90) | (95)
USA |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Plan assets | 250 | 257
Defined benefit obligation | 235 | 245
Funded Status | 15 | 12
United Kingdom |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Plan assets | 1,206 | 1,257
Defined benefit obligation | 751 | 790
Funded Status | 455 | 467
Belgium |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Plan assets | 513 | 516
Defined benefit obligation | 450 | 473
Funded Status | 63 | 43
Other countries |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Plan assets | 341 | 317
Defined benefit obligation | 368 | 353
Funded Status | € (26) | € (37)

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- Definition The present value, without deducting any plan assets, of expected future payments required to settle the obligation resulting from employee service in the current and prior periods. [Refer: Plan assets, at fair value] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2024-01-01 -Paragraph 57 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_57_a&doctype=Standard -URIDate 2024-03-27 + 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 fair value of defined benefit plan assets. Plan assets comprise assets held by a long-term employee benefit fund and qualifying insurance policies. [Refer: At fair value [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2024-01-01 -Paragraph 57 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_57_a&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The amount of 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 [domain]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 55 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_55&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The amount of deficit in a defined benefit plan. [Refer: Defined benefit plans [domain]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 55 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_55&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The fair value of any plan assets, less the present value of the defined benefit obligation. [Refer: Plan assets [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2024-01-01 -Paragraph 57 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_57_a&doctype=Standard -URIDate 2024-03-27 + Details
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