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Employees - Summary of Movements in Assets (Detail) - EUR (€) € in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of defined benefit plans [Line Items] |  |  |
Settlements | € 4 | € (2) | € 6
Actual return on plan assets (excluding amounts in net finance income/charge) | 1,475 | 1,877 | (254)
Assets [member] |  |  |
Disclosure of defined benefit plans [Line Items] |  |  |
Beginning balance | 21,183 | 20,742 |
Employee contributions | 18 | 17 |
Settlements | (8) |  |
Actual return on plan assets (excluding amounts in net finance income/charge) | 1,475 | 1,877 |
Interest income | 540 | 664 |
Employer contributions | 1,105 | 512 |
Benefit payments | (1,239) | (1,326) |
Reclassification of benefits | (1) | (2) |
Currency retranslation | (691) | (1,301) |
Ending balance | 22,382 | 21,183 | 20,742
Assets [member] | United Kingdom [member] |  |  |
Disclosure of defined benefit plans [Line Items] |  |  |
Beginning balance | 9,963 | 9,950 |
Actual return on plan assets (excluding amounts in net finance income/charge) | 863 | 1,412 |
Interest income | 270 | 329 |
Employer contributions | 778 | 202 |
Benefit payments | (457) | (456) |
Currency retranslation | (379) | (1,474) |
Ending balance | 11,038 | 9,963 | 9,950
Assets [member] | Netherlands [member] |  |  |
Disclosure of defined benefit plans [Line Items] |  |  |
Beginning balance | 5,116 | 4,873 |
Employee contributions | 1 |  |
Actual return on plan assets (excluding amounts in net finance income/charge) | 275 | 281 |
Interest income | 91 | 120 |
Employer contributions | 43 | 11 |
Benefit payments | (169) | (169) |
Ending balance | 5,357 | 5,116 | 4,873
Assets [member] | Rest of World [member] |  |  |
Disclosure of defined benefit plans [Line Items] |  |  |
Beginning balance | 6,104 | 5,919 |
Employee contributions | 17 | 17 |
Settlements | (8) |  |
Actual return on plan assets (excluding amounts in net finance income/charge) | 337 | 184 |
Interest income | 179 | 215 |
Employer contributions | 284 | 299 |
Benefit payments | (613) | (701) |
Reclassification of benefits | (1) | (2) |
Currency retranslation | (312) | 173 |
Ending balance | € 5,987 | € 6,104 | € 5,919

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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 2016-01-13 -Paragraph 141 -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2016-03-30&anchor=para_141_f&doctype=Standard -URIDate 2016-03-31 + 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 2016-01-13 -Paragraph 141 -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2016-03-30&anchor=para_141_f&doctype=Standard -URIDate 2016-03-31 + 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 2016-01-13 -Paragraph 141 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2016-03-30&anchor=para_141_e&doctype=Standard -URIDate 2016-03-31 + 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 2016-01-13 -Paragraph 141 -Subparagraph g -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2016-03-30&anchor=para_141_g&doctype=Standard -URIDate 2016-03-31 + Details
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- Definition The decrease (increase) in the net defined benefit liability (asset) resulting from the return on plan assets. The return on plans assets is interest, dividends and other revenue derived from the plan assets, together with realised and unrealised gains or losses on the plan assets, less any costs of managing plan assets and less any tax payable by the plan itself, other than tax included in the actuarial assumptions used to measure the present value of the defined benefit obligation. [Refer: Plan assets [member]; Net defined benefit liability (asset); Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2016-01-13 -Paragraph 141 -Subparagraph c -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2016-03-30&anchor=para_141_c_i&doctype=Standard -URIDate 2016-03-31 + Details
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- Definition The present value of the defined benefit obligation, less the fair value of the plan assets (if any). [Refer: Plan assets [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2016-01-13 -Paragraph 57 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2016-03-30&anchor=para_57_a&doctype=Standard -URIDate 2016-03-31 + Details
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- Definition Benefit Payments. + References No definition available. + Details
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- Definition Income as return on plan assets. + References No definition available. + Details
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- Definition Reclassification of benefits. + References No definition available. + Details
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