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Employees - Summary of Movements in Assets (Detail) - EUR (€) € in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of defined benefit plans [line items] |  |  |  |
Beginning balance |  | € 23,749 |  |
Actual return on plan assets (excluding amounts in net finance income/charge) |  | (1,494) | € (2,385) | € 1,108
Change in asset ceiling, excluding amounts included in finance cost |  | 2 | (37) |
Ending balance |  | 24,023 | 23,749 |
Assets [Member] |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |
Beginning balance |  | 23,726 | 20,880 |
Employee contributions |  | 17 | 17 |
Settlements |  | (67) |  |
Actual return on plan assets (excluding amounts in net finance income/charge) |  | 1,494 | 2,385 |
Change in asset ceiling, excluding amounts included in finance cost |  | 2 | (37) |
Interest income/ (cost) | [1] | 436 | 573 |
Employer contributions |  | 398 | 401 |
Benefit payments |  | (1,140) | (1,208) |
Others |  | 20 | 2 |
Currency retranslation |  | (880) | 713 |
Ending balance |  | 24,006 | 23,726 | 20,880
Assets [Member] | United Kingdom [Member] |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |
Beginning balance |  | 12,122 | 10,329 |
Actual return on plan assets (excluding amounts in net finance income/charge) |  | 1,109 | 1,233 |
Interest income/ (cost) | [1] | 230 | 292 |
Employer contributions |  | 104 | 94 |
Benefit payments |  | (467) | (455) |
Others |  | 46 |  |
Currency retranslation |  | (645) | 629 |
Ending balance |  | 12,499 | 12,122 | 10,329
Assets [Member] | Netherlands [Member] |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |
Beginning balance |  | 5,522 | 4,996 |
Actual return on plan assets (excluding amounts in net finance income/charge) |  | 206 | 588 |
Interest income/ (cost) | [1] | 60 | 89 |
Employer contributions |  | 12 | 14 |
Benefit payments |  | (166) | (165) |
Others |  | (47) |  |
Ending balance |  | 5,587 | 5,522 | 4,996
Assets [Member] | All other countries [member] |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |
Beginning balance |  | 6,082 | 5,555 |
Employee contributions |  | 17 | 17 |
Settlements |  | (67) |  |
Actual return on plan assets (excluding amounts in net finance income/charge) |  | 179 | 564 |
Change in asset ceiling, excluding amounts included in finance cost |  | 2 | (37) |
Interest income/ (cost) | [1] | 146 | 192 |
Employer contributions |  | 282 | 293 |
Benefit payments |  | (507) | (588) |
Others |  | 21 | 2 |
Currency retranslation |  | (235) | 84 |
Ending balance |  | € 5,920 | € 6,082 | € 5,555
[1] | This includes the impact of interest on asset ceiling.

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- Definition The decrease (increase) in net defined benefit liability (asset) resulting from contributions to a defined benefit plan by the employer. [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 2020-01-01 -Paragraph 141 -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_141_f&doctype=Standard -URIDate 2020-01-01 + Details
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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 2020-01-01 -Paragraph 141 -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_141_f&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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- Definition The increase (decrease) in the net defined benefit liability (asset) resulting from changes in foreign exchange rates. [Refer: Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2020-01-01 -Paragraph 141 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_141_e&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The increase (decrease) in the net defined benefit liability (asset) resulting from changes that the entity does not separately disclose in the same statement or note. [Refer: Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2020-01-01 -Paragraph 141 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_141&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The decrease (increase) in the net defined benefit liability (asset) resulting from payments from the plan. [Refer: Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2020-01-01 -Paragraph 141 -Subparagraph g -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_141_g&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The decrease (increase) in the net defined benefit liability (asset) resulting from payments from the plan in respect of settlements. [Refer: Gains (losses) arising from settlements, net defined benefit liability (asset); Net defined benefit liability (asset); Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2020-01-01 -Paragraph 141 -Subparagraph g -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_141_g&doctype=Standard -URIDate 2020-01-01 + 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 2020-01-01 -Paragraph 57 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_57_a&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition Asset returns. + References No definition available. + Details
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- Definition Change in asset ceiling excluding finance cost. + References No definition available. + Details
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