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Retirement benefits - Summary of Estimated Future Benefit Payments (Detail) $ in Millions | 12 Months Ended
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Dec. 31, 2017 USD ($) Years | Dec. 31, 2016 USD ($) Years
Disclosure of net defined benefit liability/asset [line items] |  |
Estimated future benefit payments | $ 158 | $ 159
Less than 1 year [member] |  |
Disclosure of net defined benefit liability/asset [line items] |  |
Estimated future benefit payments | 15 | 15
Between one and five years [member] |  |
Disclosure of net defined benefit liability/asset [line items] |  |
Estimated future benefit payments | 61 | 61
More than 5 years [member] |  |
Disclosure of net defined benefit liability/asset [line items] |  |
Estimated future benefit payments | 82 | 83
Pension plans [member] | United Kingdom [member] |  |
Disclosure of net defined benefit liability/asset [line items] |  |
Estimated future benefit payments | $ 20 | $ 15
Average duration of obligation (years) | Years | 20.5 | 21.0
Pension plans [member] | United Kingdom [member] | Between one and five years [member] |  |
Disclosure of net defined benefit liability/asset [line items] |  |
Estimated future benefit payments | $ 3 | $ 2
Pension plans [member] | United Kingdom [member] | More than 5 years [member] |  |
Disclosure of net defined benefit liability/asset [line items] |  |
Estimated future benefit payments | 17 | 13
Pension plans [member] | United States [member] |  |
Disclosure of net defined benefit liability/asset [line items] |  |
Estimated future benefit payments | $ 129 | $ 131
Average duration of obligation (years) | Years | 10.3 | 10.3
Pension plans [member] | United States [member] | Less than 1 year [member] |  |
Disclosure of net defined benefit liability/asset [line items] |  |
Estimated future benefit payments | $ 14 | $ 14
Pension plans [member] | United States [member] | Between one and five years [member] |  |
Disclosure of net defined benefit liability/asset [line items] |  |
Estimated future benefit payments | 53 | 54
Pension plans [member] | United States [member] | More than 5 years [member] |  |
Disclosure of net defined benefit liability/asset [line items] |  |
Estimated future benefit payments | 62 | 63
US post-employment benefits [member] |  |
Disclosure of net defined benefit liability/asset [line items] |  |
Estimated future benefit payments | $ 14 | $ 13
Average duration of obligation (years) | Years | 10.4 | 10.2
US post-employment benefits [member] | Less than 1 year [member] |  |
Disclosure of net defined benefit liability/asset [line items] |  |
Estimated future benefit payments | $ 1 | $ 1
US post-employment benefits [member] | Between one and five years [member] |  |
Disclosure of net defined benefit liability/asset [line items] |  |
Estimated future benefit payments | 6 | 5
US post-employment benefits [member] | More than 5 years [member] |  |
Disclosure of net defined benefit liability/asset [line items] |  |
Estimated future benefit payments | $ 7 | $ 7

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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 The weighted average duration of a defined benefit obligation. [Refer: Weighted average [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 147 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_147_c&doctype=Standard -URIDate 2017-03-09 + Details
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