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Employees - Summary of Movements in Assets (Detail) - EUR (€) € in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure of defined benefit plans [line items] |  |  |
Beginning balance | € 22,361 |  |
Settlements |  | € 4 | € (2)
Actual return on plan assets (excluding amounts in net finance income/charge) | 1,108 | (1,475) | (1,877)
Ending balance | 20,867 | 22,361 |
Assets [Member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Beginning balance | 22,382 | 21,183 |
Employee contributions | 17 | 18 |
Settlements | (1) | (8) |
Actual return on plan assets (excluding amounts in net finance income/charge) | (1,108) | 1,475 |
Interest income | 551 | 540 |
Employer contributions | 383 | 1,105 |
Benefit payments | (1,199) | (1,239) |
Currency retranslation | (135) | (691) |
Others | (10) | (1) |
Ending balance | 20,880 | 22,382 | 21,183
Assets [Member] | United Kingdom [Member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Beginning balance | 11,038 | 9,963 |
Actual return on plan assets (excluding amounts in net finance income/charge) | (459) | 863 |
Interest income | 274 | 270 |
Employer contributions | 95 | 778 |
Benefit payments | (472) | (457) |
Currency retranslation | (147) | (379) |
Ending balance | 10,329 | 11,038 | 9,963
Assets [Member] | Netherlands [Member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Beginning balance | 5,357 | 5,116 |
Employee contributions |  | 1 |
Actual return on plan assets (excluding amounts in net finance income/charge) | (303) | 275 |
Interest income | 95 | 91 |
Employer contributions | 14 | 43 |
Benefit payments | (166) | (169) |
Others | (1) |  |
Ending balance | 4,996 | 5,357 | 5,116
Assets [Member] | All other countries [member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Beginning balance | 5,987 | 6,104 |
Employee contributions | 17 | 17 |
Settlements | (1) | (8) |
Actual return on plan assets (excluding amounts in net finance income/charge) | (346) | 337 |
Interest income | 182 | 179 |
Employer contributions | 274 | 284 |
Benefit payments | (561) | (613) |
Currency retranslation | 12 | (312) |
Others | (9) | (1) |
Ending balance | € 5,555 | € 5,987 | € 6,104

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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 2017-01-01 -Paragraph 141 -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_141_f&doctype=Standard -URIDate 2017-03-09 + 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 2017-01-01 -Paragraph 141 -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_141_f&doctype=Standard -URIDate 2017-03-09 + 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 2017-01-01 -Paragraph 141 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_141_e&doctype=Standard -URIDate 2017-03-09 + 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 2017-01-01 -Paragraph 141 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_141&doctype=Standard -URIDate 2017-03-09 + 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 2017-01-01 -Paragraph 141 -Subparagraph g -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_141_g&doctype=Standard -URIDate 2017-03-09 + 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 2017-01-01 -Paragraph 141 -Subparagraph g -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_141_g&doctype=Standard -URIDate 2017-03-09 + 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 2017-01-01 -Paragraph 57 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_57_a&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition Asset returns. + References No definition available. + Details
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