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Employees - Summary of Movements in (Deficit)/Surplus (Detail) - EUR (€) € in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of defined benefit plans [line items]
Current service cost	€ (220)	€ (245)	€ (226)
Special termination benefits	(16)	(4)	(6)
Past service costs including (losses)/gains on curtailments	(41)	23	32
Settlements		4	(2)
Actual return on plan assets (excluding amounts in net finance income/charge)	(1,108)	1,475	1,877
Interest income	(551)
Actuarial gain/(loss) arising from changes in demographic assumptions	42	222	(217)
Actuarial gain/(loss) arising from changes in financial assumptions	611	(210)	(2,963)
Actuarial gain/(loss) arising from experience adjustments	18	133	82
Assets net of liabilities [member]
Disclosure of defined benefit plans [line items]
Beginning balance	(561)	(3,173)
Current service cost	(220)	(245)
Employee contributions	17	18
Special termination benefits	(16)	(4)
Past service costs including (losses)/gains on curtailments	(41)	23
Settlements		4
Actual return on plan assets (excluding amounts in net finance income/charge)	(1,108)	1,475
Interest cost	(576)	(636)
Interest income	551	540
Actuarial gain/(loss) arising from changes in demographic assumptions	42	222
Actuarial gain/(loss) arising from changes in financial assumptions	611	(210)
Actuarial gain/(loss) arising from experience adjustments	18	133
Employer contributions	383	1,105
Benefit payments	0	0
Currency retranslation	26	180
Others		7
Ending balance	(874)	(561)	(3,173)
Assets net of liabilities [member] | United Kingdom [Member]
Disclosure of defined benefit plans [line items]
Beginning balance	783	(1,018)
Current service cost	(109)	(114)
Past service costs including (losses)/gains on curtailments	(46)	5
Actual return on plan assets (excluding amounts in net finance income/charge)	(459)	863
Interest cost	(254)	(286)
Interest income	274	270
Actuarial gain/(loss) arising from changes in demographic assumptions		312
Actuarial gain/(loss) arising from changes in financial assumptions	351	(189)
Actuarial gain/(loss) arising from experience adjustments	(45)	144
Employer contributions	95	778
Benefit payments	0	0
Currency retranslation		18
Ending balance	590	783	(1,018)
Assets net of liabilities [member] | Netherlands [Member]
Disclosure of defined benefit plans [line items]
Beginning balance	444	239
Current service cost	(4)	(6)
Employee contributions		1
Past service costs including (losses)/gains on curtailments	8	12
Actual return on plan assets (excluding amounts in net finance income/charge)	(303)	275
Interest cost	(87)	(86)
Interest income	95	91
Actuarial gain/(loss) arising from changes in demographic assumptions	53	(96)
Actuarial gain/(loss) arising from changes in financial assumptions	84
Actuarial gain/(loss) arising from experience adjustments	37	(37)
Employer contributions	14	43
Benefit payments	0	0
Others	(9)	8
Ending balance	332	444	239
Assets net of liabilities [member] | All other countries [member]
Disclosure of defined benefit plans [line items]
Beginning balance	(1,788)	(2,394)
Current service cost	(107)	(125)
Employee contributions	17	17
Special termination benefits	(16)	(4)
Past service costs including (losses)/gains on curtailments	(3)	6
Settlements		4
Actual return on plan assets (excluding amounts in net finance income/charge)	(346)	337
Interest cost	(235)	(264)
Interest income	182	179
Actuarial gain/(loss) arising from changes in demographic assumptions	(11)	6
Actuarial gain/(loss) arising from changes in financial assumptions	176	(21)
Actuarial gain/(loss) arising from experience adjustments	26	26
Employer contributions	274	284
Benefit payments	0	0
Currency retranslation	26	162
Others	9	(1)
Ending balance	€ (1,796)	€ (1,788)	€ (2,394)

X

- Definition

The decrease (increase) in a net defined benefit liability (asset) resulting from actuarial gains (losses) arising from changes in demographic assumptions that result in remeasurements of the net defined benefit liability (asset). Demographic assumptions deal with matters such as: (a) mortality; (b) rates of employee turnover, disability and early retirement; (c) the proportion of plan members with dependants who will be eligible for benefits; (d) the proportion of plan members who will select each form of payment option available under the plan terms; and (e) claim rates under medical plans. [Refer: Net defined benefit liability (asset)]

+ References

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- Definition

The decrease (increase) in a net defined benefit liability (asset) resulting from actuarial gains (losses) arising from changes in financial assumptions that result in remeasurements of the net defined benefit liability (asset). Financial assumptions deal with items such as: (a) the discount rate; (b) benefit levels, excluding any cost of the benefits to be met by employees, and future salary; (c) in the case of medical benefits, future medical costs, including claim handling costs (ie the costs that will be incurred in processing and resolving claims, including legal and adjuster's fees); and (d) taxes payable by the plan on contributions relating to service before the reporting date or on benefits resulting from that service. [Refer: Net defined benefit liability (asset)]

+ References

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The decrease (increase) in a net defined benefit liability (asset) resulting from actuarial gains (losses) arising from experience adjustments that result in remeasurements of the net defined benefit liability (asset). Experience adjustments deal with the effects of differences between the previous actuarial assumptions and what has actually occurred. [Refer: Net defined benefit liability (asset)]

+ References

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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

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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
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- Definition

The increase (decrease) in the net defined benefit liability (asset) resulting from employee service in the current period. [Refer: Net defined benefit liability (asset)]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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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.

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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
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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
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- Definition

The increase (decrease) in the net defined benefit liability (asset) resulting from past service cost and gains (losses) arising from settlements. [Refer: Gains (losses) arising from settlements, net defined benefit liability (asset); Net defined benefit liability (asset)]

+ References

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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

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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

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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

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- Definition

The amount of expense in relation to termination benefits. Termination benefits are employee benefits provided in exchange for the termination of an employee's employment as a result of either: (a) an entity's decision to terminate an employee's employment before the normal retirement date; or (b) an employee's decision to accept an offer of benefits in exchange for the termination of employment. [Refer: Employee benefits expense]

+ References

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Asset returns.

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No definition available.

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Interest cost on Pensions liabilities, which is the increase during a period in the present value of a defined benefit obligation which arises because the benefits are one period closer to settlement.

+ References

No definition available.

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Interest income on plan assets.

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No definition available.

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