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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, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure of defined benefit plans [line items] |  |  |
Net interest expense | $ 4 | $ 4 | $ 4
Administration costs | 0 | 1 | 1
Operating profit before exceptional items | 4 | 5 | 5
Settlement loss including transaction costs | 15 |  |
Total | 19 | 5 | 5
Pension plans [member] | United Kingdom [member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Net interest expense | 1 | 1 | 1
Administration costs | 0 |  |
Operating profit before exceptional items | 1 | 1 | 1
Settlement loss including transaction costs | 0 |  |
Total | 1 | 1 | 1
Pension plans [member] | US and other [member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Net interest expense | 2 | 2 | 2
Administration costs | 0 | 1 | 1
Operating profit before exceptional items | 2 | 3 | 3
Settlement loss including transaction costs | 15 |  |
Total | 17 | 3 | 3
US post-employment benefits [member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Net interest expense | 1 | 1 | 1
Administration costs | 0 |  |
Operating profit before exceptional items | 1 | 1 | 1
Settlement loss including transaction costs | 0 |  |
Total | $ 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 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 2018-01-01 -Paragraph 141 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_141_b&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition Actual administration costs net plan assets. + References No definition available. + Details
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- Definition Settlement loss including transaction costs , net defined benefit liability (asset) + References No definition available. + Details
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- Details
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- Details
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- Details
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