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Employees - Summary of Movements in (Deficit)/Surplus (Detail) - EUR (€) € in Millions		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure of defined benefit plans [line items]
Current service cost		€ (223)	€ (216)	€ (220)
Special termination benefits		(37)	(5)	(16)
Past service costs including (losses)/gains on curtailments		20	65	(41)
Actual return on plan assets (excluding amounts in net finance income/charge)		1,494	2,385	(1,108)
Actuarial gain/(loss) arising from changes in demographic assumptions		246	183	42
Actuarial gain/(loss) arising from changes in financial assumptions		(1,414)	(2,138)	611
Actuarial gain/(loss) arising from experience adjustments		(78)	(12)	18
Liabilities net of assets [member]
Disclosure of defined benefit plans [line items]
Beginning balance		(196)	(874)
Current service cost		(223)	(216)
Employee contributions		17	17
Special termination benefits		(37)	(5)
Past service costs including (losses)/gains on curtailments		20	65
Settlements		7	(2)
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 cost		(445)	(603)
Interest income	[1]	436	573
Actuarial gain/(loss) arising from changes in demographic assumptions		246	183
Actuarial gain/(loss) arising from changes in financial assumptions		(1,414)	(2,138)
Actuarial gain/(loss) arising from experience adjustments		(78)	(12)
Employer contributions		398	401
Others		(18)	(18)
Currency retranslation		78	85
Ending balance		287	(196)	(874)
Liabilities net of assets [member] | United Kingdom [Member]
Disclosure of defined benefit plans [line items]
Beginning balance		1,121	590
Current service cost		(114)	(104)
Past service costs including (losses)/gains on curtailments		17	56
Actual return on plan assets (excluding amounts in net finance income/charge)		1,109	1,233
Interest cost		(208)	(276)
Interest income	[1]	230	292
Actuarial gain/(loss) arising from changes in demographic assumptions		(1)	157
Actuarial gain/(loss) arising from changes in financial assumptions		(806)	(955)
Actuarial gain/(loss) arising from experience adjustments		(67)	(44)
Employer contributions		104	94
Others		2
Currency retranslation		(36)	78
Ending balance		1,351	1,121	590
Liabilities net of assets [member] | Netherlands [Member]
Disclosure of defined benefit plans [line items]
Beginning balance		425	332
Current service cost		(3)	(4)
Actual return on plan assets (excluding amounts in net finance income/charge)		206	588
Interest cost		(55)	(82)
Interest income	[1]	60	89
Actuarial gain/(loss) arising from changes in demographic assumptions		245	14
Actuarial gain/(loss) arising from changes in financial assumptions		(354)	(511)
Actuarial gain/(loss) arising from experience adjustments		(6)	(15)
Employer contributions		12	14
Others		(3)
Ending balance		527	425	332
Liabilities net of assets [member] | All other countries [member]
Disclosure of defined benefit plans [line items]
Beginning balance		(1,742)	(1,796)
Current service cost		(106)	(108)
Employee contributions		17	17
Special termination benefits		(37)	(5)
Past service costs including (losses)/gains on curtailments		3	9
Settlements		7	(2)
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 cost		(182)	(245)
Interest income	[1]	146	192
Actuarial gain/(loss) arising from changes in demographic assumptions		2	12
Actuarial gain/(loss) arising from changes in financial assumptions		(254)	(672)
Actuarial gain/(loss) arising from experience adjustments		(5)	47
Employer contributions		282	293
Others		(17)	(18)
Currency retranslation		114	7
Ending balance		€ (1,591)	€ (1,742)	€ (1,796)
[1] This includes the impact of interest on asset ceiling.

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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- Definition

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

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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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
-Name IAS
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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 the passage of time. [Refer: Interest expense; Net defined benefit liability (asset)]

+ References

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

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

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Asset returns.

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No definition available.

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Changes In Surplus (Deficit) Plan.

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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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