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Segmental Information - Summary of Information by Reportable Segment - Result (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure of reportable segments [line items] |  |  |
System Fund revenues | $ 1,373 | $ 1,233 | $ 1,242
Reimbursement of costs | 1,171 | 1,171 | 1,103
Revenue | 4,627 | 4,337 | 4,075
Operating profit | 630 | 582 | 744
Net finance costs | (115) | (96) | (91)
Fair value gains/(losses) on contingent purchase consideration | 27 | (4) |
Profit before tax | 542 | 482 | 653
Tax | (156) | (132) | (118)
Profit for the year | 386 | 350 | 535
Exceptional items [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Operating profit | (186) | (104) | 4
Fair value gains/(losses) on contingent purchase consideration | 38 |  |
Profit before tax | (186) | (104) | 4
Tax | 20 | 27 | 85
Reportable segments [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Revenue | 2,083 | 1,933 | 1,730
Reportable segments [member] | Before exceptional items [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Operating profit | 865 | 832 | 774
System Fund [member] | Before exceptional items [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Operating profit | (49) | (146) | (34)
Americas [member] | Reportable segments [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Revenue | 1,040 | 1,051 | 999
Americas [member] | Reportable segments [member] | Before exceptional items [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Operating profit | 700 | 673 | 648
EMEAA [member] | Reportable segments [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Revenue | 723 | 569 | 457
EMEAA [member] | Reportable segments [member] | Before exceptional items [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Operating profit | 217 | 206 | 175
Greater China [member] | Reportable segments [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Revenue | 135 | 143 | 117
Greater China [member] | Reportable segments [member] | Before exceptional items [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Operating profit | 73 | 70 | 53
Central [member] | Reportable segments [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Revenue | 185 | 170 | 157
Central [member] | Reportable segments [member] | Before exceptional items [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Operating profit | $ (125) | $ (117) | $ (102)

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