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Employees - Schedule of Sensitivity of Pension Liabilities to Changes in the Weighted Key Assumptions (Detail)	12 Months Ended
	Dec. 31, 2020
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Change in assumption	Increase by 1.0%	[1]
Discount Rate [Member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Change in assumption	Increase by 0.5%
Change in liabilities	(8.00%)
Discount Rate [Member] | United Kingdom [Member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Change in liabilities	(8.00%)
Discount Rate [Member] | Netherlands [Member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Change in liabilities	(9.00%)
Inflation Rate [Member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Change in assumption	Increase by 0.5%
Change in liabilities	6.00%
Inflation Rate [Member] | United Kingdom [Member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Change in liabilities	6.00%
Inflation Rate [Member] | Netherlands [Member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Change in liabilities	9.00%
Life expectancy [Member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Change in assumption	Increase by 1 year
Change in liabilities	5.00%
Life expectancy [Member] | United Kingdom [Member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Change in liabilities	5.00%
Life expectancy [Member] | Netherlands [Member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Change in liabilities	5.00%
Long-Term Medical Cost Inflation [Member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Change in liabilities	3.00%	[1]
Long-Term Medical Cost Inflation [Member] | United Kingdom [Member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Change in liabilities	0.00%	[1]
Long-Term Medical Cost Inflation [Member] | Netherlands [Member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Change in liabilities	0.00%	[1]
[1] Long-term medical cost inflation only relates to post-retirement medical plans and its impact on these liabilities.

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- Definition

The description of changes in the methods and assumptions used in preparing a sensitivity analysis for significant actuarial assumptions. [Refer: Actuarial assumptions [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 19
-IssueDate 2020-01-01
-Paragraph 145
-Subparagraph c
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-URIDate 2020-01-01

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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.

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- Definition

Change in pension liabilities as a result of change in life expectancy assumptions.

+ References

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