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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, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure of reportable segments [line items] |  |  |
Capital expenditure per management reporting | $ 265 | $ 251 | $ 350
Contract acquisition costs | (64) | (58) |
Right-of-use assets | (62) |  |
Timing differences and other adjustments | 1 | 1 |
Additions per the Financial Statements | 208 | 194 |
Comprising additions to: |  |  |
Property, plant and equipment | 108 | 112 |
Intangible assets | 77 | 47 |
Investment in associates and joint ventures | 14 | 3 |
Other financial assets | 9 | 32 |
Additions per the Group Financial Statements | 208 | 194 |
Americas [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Capital expenditure per management reporting | 57 | 74 | 120
Contract acquisition costs |  | (32) |
Right-of-use assets | (27) |  |
Timing differences and other adjustments | 4 | 1 |
Additions per the Financial Statements | 34 | 43 |
Comprising additions to: |  |  |
Intangible assets | 19 | 13 |
Investment in associates and joint ventures | 14 | 3 |
Other financial assets | 1 | 27 |
Additions per the Group Financial Statements | 34 | 43 |
EMEAA [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Capital expenditure per management reporting | 71 | 33 | 26
Contract acquisition costs | 4 | (26) |
Right-of-use assets | (35) |  |
Timing differences and other adjustments | 1 |  |
Additions per the Financial Statements | 41 | 7 |
Comprising additions to: |  |  |
Property, plant and equipment | 4 |  |
Intangible assets | 29 | 2 |
Other financial assets | 8 | 5 |
Additions per the Group Financial Statements | 41 | 7 |
Greater China [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Capital expenditure per management reporting |  | 2 | 2
Additions per the Financial Statements |  | 2 |
Comprising additions to: |  |  |
Intangible assets |  | 2 |
Additions per the Group Financial Statements |  | 2 |
Central [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Capital expenditure per management reporting | 137 | 142 | $ 202
Timing differences and other adjustments | (4) |  |
Additions per the Financial Statements | 133 | 142 |
Comprising additions to: |  |  |
Property, plant and equipment | 104 | 112 |
Intangible assets | 29 | 30 |
Additions per the Group Financial Statements | $ 133 | $ 142 |

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