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Property, plant and equipment - Summary of Net Book Value of Property, Plant and Equipment by Operating Segment (Detail) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
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Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property plant and equipment | $ 201 | $ 309 | $ 273
Land and buildings [member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property plant and equipment | 93 | 134 | 127
Fixtures, fittings and equipment [member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property plant and equipment | 108 | $ 175 | $ 146
Americas [member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property plant and equipment | 127 |  |
Americas [member] | Land and buildings [member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property plant and equipment | 81 |  |
Americas [member] | Fixtures, fittings and equipment [member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property plant and equipment | 46 |  |
EMEAA [member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property plant and equipment | 11 |  |
EMEAA [member] | Land and buildings [member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property plant and equipment | 1 |  |
EMEAA [member] | Fixtures, fittings and equipment [member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property plant and equipment | 10 |  |
Central [member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property plant and equipment | 63 |  |
Central [member] | Land and buildings [member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property plant and equipment | 11 |  |
Central [member] | Fixtures, fittings and equipment [member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property plant and equipment | $ 52 |  |

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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 amount of tangible assets that: (a) are held for use in the production or supply of goods or services, for rental to others, or for administrative purposes; and (b) are expected to be used during more than one period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2020-01-01 -Paragraph 73 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2020-en-r&anchor=para_73_e&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 54 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_54_a&doctype=Standard -URIDate 2020-01-01 + Details
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