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Employees - Summary of Assumptions for Pension Plans Representing Approximately 00% of Defined Benefit Pension Liability (Detail) - yr | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
United Kingdom [Member] |  |
Disclosure of defined benefit plans [line items] |  |
Discount rate | 1.40% | 2.00%
Inflation | 2.70% | 2.90%
Rate of increase in salaries | 3.30% | 3.20%
Number of years a current pensioner is expected to live beyond age 65 - Men | 21.7 | 21.6
Number of years a current pensioner is expected to live beyond age 65 - Women | 23.4 | 23.4
Number of years a future pensioner currently aged 45 is expected to live beyond age 65 - Men | 22.7 | 22.6
Number of years a future pensioner currently aged 45 is expected to live beyond age 65 - Women | 24.6 | 24.6
United Kingdom [Member] | Pensions in payment [Member] |  |
Disclosure of defined benefit plans [line items] |  |
Rate of increase for pensions in payment (where provided) | 2.70% | 2.80%
United Kingdom [Member] | Pensions in deferment [Member] |  |
Disclosure of defined benefit plans [line items] |  |
Rate of increase for pensions in deferment (where provided) | 2.70% | 2.80%
Netherlands [Member] |  |
Disclosure of defined benefit plans [line items] |  |
Discount rate | 0.70% | 1.10%
Inflation | 1.50% | 1.50%
Rate of increase in salaries | 2.00% | 2.00%
Number of years a current pensioner is expected to live beyond age 65 - Men | 21.5 | 22.6
Number of years a current pensioner is expected to live beyond age 65 - Women | 23.6 | 24.1
Number of years a future pensioner currently aged 45 is expected to live beyond age 65 - Men | 23.4 | 24.5
Number of years a future pensioner currently aged 45 is expected to live beyond age 65 - Women | 25.4 | 26.2
Netherlands [Member] | Pensions in payment [Member] |  |
Disclosure of defined benefit plans [line items] |  |
Rate of increase for pensions in payment (where provided) | 1.50% | 1.50%
Netherlands [Member] | Pensions in deferment [Member] |  |
Disclosure of defined benefit plans [line items] |  |
Rate of increase for pensions in deferment (where provided) | 1.50% | 1.50%

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- Definition The discount rate used as the significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit obligation, at present value; Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2020-01-01 -Paragraph 144 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_144&doctype=Standard -URIDate 2020-01-01 + Details
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Balance Type: | na
Period Type: | instant

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- Definition The expected rate of inflation that is used as a significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit plans [member]; Defined benefit obligation, at present value; Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2020-01-01 -Paragraph 144 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_144&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The expected rate of salary increases used as a significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit plans [member]; Defined benefit obligation, at present value; Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2020-01-01 -Paragraph 144 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_144&doctype=Standard -URIDate 2020-01-01 + 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 Actuarial assumption of increase for pensions in deferment where provided + References No definition available. + Details
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- Definition Actuarial assumption of increase for pensions in payment where provided. + References No definition available. + Details
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- Definition Longevity for current pensioners, females. + References No definition available. + Details
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- Definition Longevity for current pensioners, males. + References No definition available. + Details
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- Definition Longevity for future pensioners, females. + References No definition available. + Details
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Balance Type: | na
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- Definition Longevity for future pensioners, males. + References No definition available. + Details
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- Details
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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- Details
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