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Retirement benefits - Summary of Movement in Benefit Obligation (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Disclosure of defined benefit plans [line items] |  |
Balance at 1 January | $ 3 |
Re-measurement(gains)/losses | 3 | $ (3)
Balance at 31 December | 0 | 3
Comprising: |  |
Balance at 31 December | 0 | 3
Retirement benefit obligations [member] |  |
Disclosure of defined benefit plans [line items] |  |
Balance at 1 January | 250 | 244
Interest expense | 6 | 9
Benefits paid | (11) | (15)
Settlement payments | (150) |
Settlement loss | 14 |
Re-measurement(gains)/losses | (17) | 10
Exchange adjustments | (1) | 2
Balance at 31 December | 91 | 250
Comprising: |  |
Funded plans | 0 | 146
Unfunded plans | 91 | 104
Balance at 31 December | 91 | 250
Pension plans [member] | United Kingdom [member] | Retirement benefit obligations [member] |  |
Disclosure of defined benefit plans [line items] |  |
Balance at 1 January | 29 | 27
Interest expense | 1 | 1
Benefits paid | (1) | (1)
Settlement payments | 0 |
Settlement loss | 0 |
Re-measurement(gains)/losses | (4) |
Exchange adjustments | (1) | 2
Balance at 31 December | 24 | 29
Comprising: |  |
Funded plans | 0 |
Unfunded plans | 24 | 29
Balance at 31 December | 24 | 29
Pension plans [member] | US and other [member] | Retirement benefit obligations [member] |  |
Disclosure of defined benefit plans [line items] |  |
Balance at 1 January | 197 | 195
Interest expense | 4 | 7
Benefits paid | (9) | (13)
Settlement payments | (150) |
Settlement loss | 14 |
Re-measurement(gains)/losses | (11) | 8
Exchange adjustments | 0 |
Balance at 31 December | 45 | 197
Comprising: |  |
Funded plans | 0 | 146
Unfunded plans | 45 | 51
Balance at 31 December | 45 | 197
US post-employment benefits [member] | Retirement benefit obligations [member] |  |
Disclosure of defined benefit plans [line items] |  |
Balance at 1 January | 24 | 22
Interest expense | 1 | 1
Benefits paid | (1) | (1)
Settlement payments | 0 |
Settlement loss | 0 |
Re-measurement(gains)/losses | (2) | 2
Exchange adjustments | 0 |
Balance at 31 December | 22 | 24
Comprising: |  |
Funded plans | 0 |
Unfunded plans | 22 | 24
Balance at 31 December | $ 22 | $ 24

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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 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 2018-01-01 -Paragraph 141 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_141_d&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The increase (decrease) in the net defined benefit liability (asset) resulting from changes in foreign exchange rates. [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 e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_141_e&doctype=Standard -URIDate 2018-03-16 + 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 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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- Definition The decrease (increase) in the net defined benefit liability (asset) resulting from payments from the plan. [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 g -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_141_g&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The decrease (increase) in the net defined benefit liability (asset) resulting from payments from the plan in respect of settlements. [Refer: Gains (losses) arising from settlements, net defined benefit liability (asset); Net defined benefit liability (asset); Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2018-01-01 -Paragraph 141 -Subparagraph g -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_141_g&doctype=Standard -URIDate 2018-03-16 + Details
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