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Employees - Summary of Principal Defined Benefit Liabilities and Split of Liabilities Between Different Categories of Plan Participants (Detail) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
United Kingdom [member] |  |
Disclosure of defined benefit plans [Line Items] |  |
Duration (years) | 17 years | 18 years
Netherlands [member] |  |
Disclosure of defined benefit plans [Line Items] |  |
Duration (years) | 19 years | 20 years
Rest of World [member] |  |
Disclosure of defined benefit plans [Line Items] |  |
Duration (years) | 13 years | 14 years
Bottom of range [member] |  |
Disclosure of defined benefit plans [Line Items] |  |
Duration (years) | 8 years | 8 years
Top of range [member] |  |
Disclosure of defined benefit plans [Line Items] |  |
Duration (years) | 24 years | 20 years
Active Members [member] |  |
Disclosure of defined benefit plans [Line Items] |  |
Percentage of defined benefit liabilities | 18.00% | 20.00%
Active Members [member] | United Kingdom [member] |  |
Disclosure of defined benefit plans [Line Items] |  |
Percentage of defined benefit liabilities | 14.00% | 15.00%
Active Members [member] | Netherlands [member] |  |
Disclosure of defined benefit plans [Line Items] |  |
Percentage of defined benefit liabilities | 22.00% | 25.00%
Active Members [member] | Rest of World [member] |  |
Disclosure of defined benefit plans [Line Items] |  |
Percentage of defined benefit liabilities | 16.00% | 19.00%
Deferred Members [member] |  |
Disclosure of defined benefit plans [Line Items] |  |
Percentage of defined benefit liabilities | 26.00% | 26.00%
Deferred Members [member] | United Kingdom [member] |  |
Disclosure of defined benefit plans [Line Items] |  |
Percentage of defined benefit liabilities | 32.00% | 33.00%
Deferred Members [member] | Netherlands [member] |  |
Disclosure of defined benefit plans [Line Items] |  |
Percentage of defined benefit liabilities | 30.00% | 30.00%
Deferred Members [member] | Rest of World [member] |  |
Disclosure of defined benefit plans [Line Items] |  |
Percentage of defined benefit liabilities | 15.00% | 14.00%
Retired Members [member] |  |
Disclosure of defined benefit plans [Line Items] |  |
Percentage of defined benefit liabilities | 56.00% | 54.00%
Retired Members [member] | United Kingdom [member] |  |
Disclosure of defined benefit plans [Line Items] |  |
Percentage of defined benefit liabilities | 54.00% | 52.00%
Retired Members [member] | Netherlands [member] |  |
Disclosure of defined benefit plans [Line Items] |  |
Percentage of defined benefit liabilities | 48.00% | 45.00%
Retired Members [member] | Rest of World [member] |  |
Disclosure of defined benefit plans [Line Items] |  |
Percentage of defined benefit liabilities | 69.00% | 67.00%

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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 Percentage of defined benefit liabilities participants. + References No definition available. + Details
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- Definition Principal defined liabilities period. + References No definition available. + Details
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- Details
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- Details
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- Details
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- Details
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- Details
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- Details
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- Details
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- Details
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