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Employees - Summary of Assumptions for Pension Plans Representing Approximately 84% of Defined Benefit Pension Liability (Detail) - yr | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
United Kingdom [member] |  |
Disclosure of defined benefit plans [Line Items] |  |
Discount rate | 2.50% | 2.70%
Inflation | 3.10% | 3.20%
Rate of increase in salaries | 3.00% | 3.10%
Number of years a current pensioner is expected to live beyond age 65 - Men | 22.1 | 22.5
Number of years a current pensioner is expected to live beyond age 65 - Women | 24.0 | 24.6
Number of years a future pensioner currently aged 45 is expected to live beyond age 65 - Men | 22.6 | 23.8
Number of years a future pensioner currently aged 45 is expected to live beyond age 65 - Women | 25.6 | 26.5
United Kingdom [member] | Pensions in payment [member] |  |
Disclosure of defined benefit plans [Line Items] |  |
Rate of increase for pensions | 3.00% | 3.10%
United Kingdom [member] | Pensions in deferment [member] |  |
Disclosure of defined benefit plans [Line Items] |  |
Rate of increase for pensions | 3.00% | 3.10%
Netherlands [member] |  |
Disclosure of defined benefit plans [Line Items] |  |
Discount rate | 1.80% | 1.80%
Inflation | 1.70% | 1.70%
Rate of increase in salaries | 2.20% | 2.20%
Number of years a current pensioner is expected to live beyond age 65 - Men | 22.5 | 21.8
Number of years a current pensioner is expected to live beyond age 65 - Women | 24.3 | 24.0
Number of years a future pensioner currently aged 45 is expected to live beyond age 65 - Men | 24.6 | 24.1
Number of years a future pensioner currently aged 45 is expected to live beyond age 65 - Women | 26.6 | 26.3
Netherlands [member] | Pensions in payment [member] |  |
Disclosure of defined benefit plans [Line Items] |  |
Rate of increase for pensions | 1.70% | 1.70%
Netherlands [member] | Pensions in deferment [member] |  |
Disclosure of defined benefit plans [Line Items] |  |
Rate of increase for pensions | 1.70% | 1.70%

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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 2016-01-13 -Paragraph 144 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2016-03-30&anchor=para_144&doctype=Standard -URIDate 2016-03-31 + Details
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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 2016-01-13 -Paragraph 144 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2016-03-30&anchor=para_144&doctype=Standard -URIDate 2016-03-31 + Details
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- Definition The expected rate of increases in pension 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 2016-01-13 -Paragraph 144 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2016-03-30&anchor=para_144&doctype=Standard -URIDate 2016-03-31 + 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 2016-01-13 -Paragraph 144 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2016-03-30&anchor=para_144&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 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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- 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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- Details
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