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Retirement benefits - Summary of Estimated Future Benefit Payments (Detail) $ in Millions | 12 Months Ended
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Dec. 31, 2018 USD ($) Years | Dec. 31, 2017 USD ($) Years
Disclosure of net defined benefit liability/asset [line items] |  |
Estimated future benefit payments | $ 66 | $ 163
Due within one year [member] |  |
Disclosure of net defined benefit liability/asset [line items] |  |
Estimated future benefit payments | 5 | 15
Between one and five years [member] |  |
Disclosure of net defined benefit liability/asset [line items] |  |
Estimated future benefit payments | 23 | 62
More than 5 years [member] |  |
Disclosure of net defined benefit liability/asset [line items] |  |
Estimated future benefit payments | 38 | 86
Pension plans [member] | United Kingdom [member] |  |
Disclosure of net defined benefit liability/asset [line items] |  |
Estimated future benefit payments | $ 19 | $ 20
Average duration of obligation (years) | Years | 19.5 | 20.5
Pension plans [member] | United Kingdom [member] | Due within one year [member] |  |
Disclosure of net defined benefit liability/asset [line items] |  |
Estimated future benefit payments | $ 0 |
Pension plans [member] | United Kingdom [member] | Between one and five years [member] |  |
Disclosure of net defined benefit liability/asset [line items] |  |
Estimated future benefit payments | 3 | $ 3
Pension plans [member] | United Kingdom [member] | More than 5 years [member] |  |
Disclosure of net defined benefit liability/asset [line items] |  |
Estimated future benefit payments | 16 | 17
Pension plans [member] | United States [member] |  |
Disclosure of net defined benefit liability/asset [line items] |  |
Estimated future benefit payments | $ 33 | $ 129
Average duration of obligation (years) | Years | 9.2 | 10.3
Pension plans [member] | United States [member] | Due within one year [member] |  |
Disclosure of net defined benefit liability/asset [line items] |  |
Estimated future benefit payments | $ 4 | $ 14
Pension plans [member] | United States [member] | Between one and five years [member] |  |
Disclosure of net defined benefit liability/asset [line items] |  |
Estimated future benefit payments | 14 | 53
Pension plans [member] | United States [member] | More than 5 years [member] |  |
Disclosure of net defined benefit liability/asset [line items] |  |
Estimated future benefit payments | 15 | 62
US post-employment benefits [member] |  |
Disclosure of net defined benefit liability/asset [line items] |  |
Estimated future benefit payments | $ 14 | $ 14
Average duration of obligation (years) | Years | 9.6 | 10.4
US post-employment benefits [member] | Due within one year [member] |  |
Disclosure of net defined benefit liability/asset [line items] |  |
Estimated future benefit payments | $ 1 | $ 1
US post-employment benefits [member] | Between one and five years [member] |  |
Disclosure of net defined benefit liability/asset [line items] |  |
Estimated future benefit payments | 6 | 6
US post-employment benefits [member] | More than 5 years [member] |  |
Disclosure of net defined benefit liability/asset [line items] |  |
Estimated future benefit payments | $ 7 | $ 7

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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 weighted average duration of a defined benefit obligation. [Refer: Weighted average [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2018-01-01 -Paragraph 147 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_147_c&doctype=Standard -URIDate 2018-03-16 + Details
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