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Segmental Information - Summary of Information by Reportable Segment - Reconciliation of Capital Expenditure (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Disclosure of reportable segments [line items] |  |
Capital expenditure per management reporting | $ 148 | $ 265
Contract acquisition costs | (74) | (64)
Timing differences and other adjustments | 20 | 1
Additions per the Financial Statements | 104 | 208
Comprising additions to: |  |
Goodwill and other intangible assets | 52 | 108
Property, plant and equipment | 30 | 77
Investment in associates and joint ventures | 17 | 14
Other financial assets | 5 | 9
Additions per the Group Financial Statements | 104 | 208
Key money paid [member] |  |
Disclosure of reportable segments [line items] |  |
Contract acquisition costs | (64) | (62)
Americas [member] |  |
Disclosure of reportable segments [line items] |  |
Capital expenditure per management reporting | 46 | 57
Contract acquisition costs | (33) | (27)
Timing differences and other adjustments | 17 | 4
Additions per the Financial Statements | 30 | 34
Comprising additions to: |  |
Goodwill and other intangible assets | 1 |
Property, plant and equipment | 12 | 19
Investment in associates and joint ventures | 17 | 14
Other financial assets |  | 1
Additions per the Group Financial Statements | 30 | 34
EMEAA [member] |  |
Disclosure of reportable segments [line items] |  |
Capital expenditure per management reporting | 44 | 71
Contract acquisition costs | (29) | (35)
Timing differences and other adjustments | 4 | 1
Additions per the Financial Statements | 19 | 41
Comprising additions to: |  |
Goodwill and other intangible assets | 1 | 4
Property, plant and equipment | 13 | 29
Other financial assets | 5 | 8
Additions per the Group Financial Statements | 19 | 41
Greater China [member] |  |
Disclosure of reportable segments [line items] |  |
Capital expenditure per management reporting | 2 |
Contract acquisition costs | (2) |
Central [member] |  |
Disclosure of reportable segments [line items] |  |
Capital expenditure per management reporting | 56 | 137
Timing differences and other adjustments | (1) | (4)
Additions per the Financial Statements | 55 | 133
Comprising additions to: |  |
Goodwill and other intangible assets | 50 | 104
Property, plant and equipment | 5 | 29
Additions per the Group Financial Statements | $ 55 | $ 133

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- Definition The amount of additions to property, plant and equipment other than those acquired through business combinations. [Refer: Business combinations [member]; Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2020-01-01 -Paragraph 73 -Subparagraph e -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2020-en-r&anchor=para_73_e_i&doctype=Standard -URIDate 2020-01-01 + Details
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