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Retirement benefits - Summary of Estimated Future Benefit Payments (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Disclosure of net defined benefit liability/asset [line items] |  |
Estimated future benefit payments | $ 129 | $ 135
Due within one year [member] |  |
Disclosure of net defined benefit liability/asset [line items] |  |
Estimated future benefit payments | 6 | 6
Between one and five years [member] |  |
Disclosure of net defined benefit liability/asset [line items] |  |
Estimated future benefit payments | 22 | 22
More than 5 years [member] |  |
Disclosure of net defined benefit liability/asset [line items] |  |
Estimated future benefit payments | $ 101 | $ 107
Plan [member] | United Kingdom [member] |  |
Disclosure of net defined benefit liability/asset [line items] |  |
Average duration of obligation (years) | 19 years | 18 years
Plan [member] | United States [member] |  |
Disclosure of net defined benefit liability/asset [line items] |  |
Average duration of obligation (years) | 9 years 3 months 18 days | 9 years 3 months 18 days
US post-retirement plan |  |
Disclosure of net defined benefit liability/asset [line items] |  |
Average duration of obligation (years) | 9 years 10 months 24 days | 9 years 9 months 18 days

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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 2020-01-01 -Paragraph 147 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_147_c&doctype=Standard -URIDate 2020-01-01 + Details
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