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Retirement benefits - Summary of Movement in Asset Restriction (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Disclosure of net defined benefit liability/asset [line items] |  |
Balance at 1 January | $ 3 |
Re-measurement(losses)/gains | (3) | $ 3
Balance at 31 December | 0 | 3
Pension plans [member] | United Kingdom [member] |  |
Disclosure of net defined benefit liability/asset [line items] |  |
Balance at 1 January | 0 |
Re-measurement(losses)/gains | 0 |
Balance at 31 December | 0 | 0
Pension plans [member] | US and other [member] |  |
Disclosure of net defined benefit liability/asset [line items] |  |
Balance at 1 January | 3 |
Re-measurement(losses)/gains | (3) | 3
Balance at 31 December | 0 | 3
US post-employment benefits [member] |  |
Disclosure of net defined benefit liability/asset [line items] |  |
Balance at 1 January | 0 |
Re-measurement(losses)/gains | 0 |
Balance at 31 December | $ 0 | $ 0

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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 a net defined benefit liability (asset) resulting from the remeasurement of that net defined benefit liability (asset). [Refer: 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 c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_141_c&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of deficit or surplus in a defined benefit plan, adjusted for any effect of limiting a net defined benefit asset to the asset ceiling. [Refer: Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2018-01-01 -Paragraph 140 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_140_a&doctype=Standard -URIDate 2018-03-16 + Details
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- Details
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