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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, 2018 | Dec. 31, 2017
United Kingdom [Member] |  |
Disclosure of defined benefit plans [line items] |  |
Duration (years) | 17 years | 17 years
Netherlands [Member] |  |
Disclosure of defined benefit plans [line items] |  |
Duration (years) | 18 years | 19 years
All other countries [member] |  |
Disclosure of defined benefit plans [line items] |  |
Duration (years) | 12 years | 13 years
Bottom of range [member] |  |
Disclosure of defined benefit plans [line items] |  |
Duration (years) | 7 years | 8 years
Top of range [member] |  |
Disclosure of defined benefit plans [line items] |  |
Duration (years) | 23 years | 24 years
Active members [Member] |  |
Disclosure of defined benefit plans [line items] |  |
Percentage of defined benefit liabilities | 15.00% | 18.00%
Active members [Member] | United Kingdom [Member] |  |
Disclosure of defined benefit plans [line items] |  |
Percentage of defined benefit liabilities | 12.00% | 14.00%
Active members [Member] | Netherlands [Member] |  |
Disclosure of defined benefit plans [line items] |  |
Percentage of defined benefit liabilities | 15.00% | 22.00%
Active members [Member] | All other countries [member] |  |
Disclosure of defined benefit plans [line items] |  |
Percentage of defined benefit liabilities | 21.00% | 16.00%
Deferred members [Member] |  |
Disclosure of defined benefit plans [line items] |  |
Percentage of defined benefit liabilities | 29.00% | 26.00%
Deferred members [Member] | United Kingdom [Member] |  |
Disclosure of defined benefit plans [line items] |  |
Percentage of defined benefit liabilities | 33.00% | 32.00%
Deferred members [Member] | Netherlands [Member] |  |
Disclosure of defined benefit plans [line items] |  |
Percentage of defined benefit liabilities | 38.00% | 30.00%
Deferred members [Member] | All other countries [member] |  |
Disclosure of defined benefit plans [line items] |  |
Percentage of defined benefit liabilities | 16.00% | 15.00%
Retired members [Member] |  |
Disclosure of defined benefit plans [line items] |  |
Percentage of defined benefit liabilities | 56.00% | 56.00%
Retired members [Member] | United Kingdom [Member] |  |
Disclosure of defined benefit plans [line items] |  |
Percentage of defined benefit liabilities | 55.00% | 54.00%
Retired members [Member] | Netherlands [Member] |  |
Disclosure of defined benefit plans [line items] |  |
Percentage of defined benefit liabilities | 47.00% | 48.00%
Retired members [Member] | All other countries [member] |  |
Disclosure of defined benefit plans [line items] |  |
Percentage of defined benefit liabilities | 63.00% | 69.00%

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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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