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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, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure of reportable segments [line items] |  |  |
Capital expenditure per management reporting | $ 243 | $ 336 | $ 238
Contract acquisition costs | (58) | (57) |
Landlord contributions to property, plant and equipment | 8 | 14 |
Timing differences and other adjustments | 1 | (13) |
Additions per the Financial Statements | 194 | 280 |
Property, plant and equipment | 47 | 44 |
Intangible assets | 112 | 172 |
Investment in associates and joint ventures | 3 | 47 |
Other financial assets | 32 | 17 |
Additions per the Financial Statements | 194 | 280 |
Americas [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Capital expenditure per management reporting | 74 | 120 | 67
Contract acquisition costs | (32) | (36) |
Landlord contributions to property, plant and equipment | 0 |  |
Timing differences and other adjustments | 1 | (12) |
Additions per the Financial Statements | 43 | 72 |
Property, plant and equipment | 13 | 10 |
Intangible assets | 0 | 3 |
Investment in associates and joint ventures | 3 | 47 |
Other financial assets | 27 | 12 |
Additions per the Financial Statements | 43 | 72 |
EMEAA [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Capital expenditure per management reporting | 33 | 26 | 22
Contract acquisition costs | (26) | (21) |
Landlord contributions to property, plant and equipment | 0 |  |
Timing differences and other adjustments | 0 |  |
Additions per the Financial Statements | 7 | 5 |
Property, plant and equipment | 2 |  |
Intangible assets | 0 |  |
Investment in associates and joint ventures | 0 |  |
Other financial assets | 5 | 5 |
Additions per the Financial Statements | 7 | 5 |
Greater China [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Capital expenditure per management reporting | 2 | 2 | 1
Contract acquisition costs | 0 |  |
Landlord contributions to property, plant and equipment | 0 |  |
Timing differences and other adjustments | 0 |  |
Additions per the Financial Statements | 2 | 2 |
Property, plant and equipment | 2 | 2 |
Intangible assets | 0 |  |
Investment in associates and joint ventures | 0 |  |
Other financial assets | 0 |  |
Additions per the Financial Statements | 2 | 2 |
Central [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Capital expenditure per management reporting | 134 | 188 | $ 148
Contract acquisition costs | 0 |  |
Landlord contributions to property, plant and equipment | 8 | 14 |
Timing differences and other adjustments | 0 | (1) |
Additions per the Financial Statements | 142 | 201 |
Property, plant and equipment | 30 | 32 |
Intangible assets | 112 | 169 |
Investment in associates and joint ventures | 0 |  |
Other financial assets | 0 |  |
Additions per the Financial Statements | $ 142 | $ 201 |

X
- 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 2018-01-01 -Paragraph 73 -Subparagraph e -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2018-03-01&anchor=para_73_e_i&doctype=Standard -URIDate 2018-03-16 + Details
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