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Retirement benefits - Defined Benefit Plans - Amounts Recognised as Administrative Expenses (Detail) - Administrative expenses [member] - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of defined benefit plans [line items] |  |  |
Net interest expense | $ 4 | $ 4 | $ 5
Administration costs | 1 | 1 | 2
Settlement cost (gain) |  |  | (2)
Operating profit | 5 | 5 | 5
Pension plans [member] | United Kingdom [member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Net interest expense | 1 | 1 | 1
Administration costs |  |  | 1
Operating profit | 1 | 1 | 2
Pension plans [member] | US and other [member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Net interest expense | 2 | 2 | 3
Administration costs | 1 | 1 | 1
Settlement cost (gain) |  |  | (2)
Operating profit | 3 | 3 | 2
US post-employment benefits [member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Net interest expense | 1 | 1 | 1
Operating profit | $ 1 | $ 1 | $ 1

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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 decrease (increase) in the net defined benefit liability (asset) resulting from settlements. Settlements are transactions that eliminate all further legal or constructive obligations for part or all of the benefits provided under a defined benefit plan, other than a payment of benefits to, or on behalf of, employees that is set out in the terms of the plan and included in the actuarial assumptions. [Refer: Net defined benefit liability (asset); Defined benefit plans [member]; Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 141 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_141_d&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The increase (decrease) in the net defined benefit liability (asset) resulting from the passage of time. [Refer: Interest expense; Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 141 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_141_b&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition Actual administration costs net plan assets. + References No definition available. + Details
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- Definition Profit (loss) from operating activities before exceptional items and remeasurements. + References No definition available. + Details
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- Details
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- Details
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- Details
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