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Retirement benefits - Defined Benefit Plans - Summary of Amounts Recognised on the Balance Sheet (Detail) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Disclosure of defined benefit plans [line items] |  |
Fair value of plan assets | $ 152 | $ 148
Present value of benefit obligations | (250) | (244)
Retirement benefit assets [member] |  |
Disclosure of defined benefit plans [line items] |  |
Fair value of plan assets | 152 |
Present value of benefit obligations | (146) |
Surplus in schemes | 6 |
Asset restriction | (3) |
Total retirement benefit obligations | 3 |
Retirement benefit obligations [member] |  |
Disclosure of defined benefit plans [line items] |  |
Fair value of plan assets |  | 148
Present value of benefit obligations | (104) | (244)
Total retirement benefit obligations | (104) | (96)
Pension plans [member] | United Kingdom [member] |  |
Disclosure of defined benefit plans [line items] |  |
Present value of benefit obligations | (29) | (27)
Pension plans [member] | United Kingdom [member] | Retirement benefit obligations [member] |  |
Disclosure of defined benefit plans [line items] |  |
Present value of benefit obligations | (29) | (27)
Total retirement benefit obligations | (29) | (27)
Pension plans [member] | US and other [member] |  |
Disclosure of defined benefit plans [line items] |  |
Fair value of plan assets | 152 | 148
Present value of benefit obligations | (197) | (195)
Pension plans [member] | US and other [member] | Retirement benefit assets [member] |  |
Disclosure of defined benefit plans [line items] |  |
Fair value of plan assets | 152 |
Present value of benefit obligations | (146) |
Surplus in schemes | 6 |
Asset restriction | (3) |
Total retirement benefit obligations | 3 |
Pension plans [member] | US and other [member] | Retirement benefit obligations [member] |  |
Disclosure of defined benefit plans [line items] |  |
Fair value of plan assets |  | 148
Present value of benefit obligations | (51) | (195)
Total retirement benefit obligations | (51) | (47)
US post-employment benefits [member] |  |
Disclosure of defined benefit plans [line items] |  |
Present value of benefit obligations | (24) | (22)
US post-employment benefits [member] | Retirement benefit obligations [member] |  |
Disclosure of defined benefit plans [line items] |  |
Present value of benefit obligations | (24) | (22)
Total retirement benefit obligations | $ (24) | $ (22)

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- Definition The present value, without deducting any plan assets, of expected future payments required to settle the obligation resulting from employee service in the current and prior periods. [Refer: Plan assets, at fair value] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 57 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_57_a&doctype=Standard -URIDate 2017-03-09 + Details
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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 fair value of defined benefit plan assets. Plan assets comprise assets held by a long-term employee benefit fund and qualifying insurance policies. [Refer: At fair value [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 57 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_57_a&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The present value of the defined benefit obligation, less the fair value of the plan assets (if any). [Refer: Plan assets [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 57 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_57_a&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition Defined benefit plan surplus net. + References No definition available. + Details
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- Definition Effect Of Asset Ceiling + References No definition available. + Details
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- Details
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- Details
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- Details
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