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Segmental Information - Summary of Information by Reportable Segment - Result (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure of reportable segments [line items] |  |  |
System Fund revenues | $ 1,233 | $ 1,242 | $ 1,199
Reimbursement of costs | 1,171 | 1,103 | 1,046
Revenue | 4,337 | 4,075 | 3,912
Operating profit | 566 | 728 | 712
Net finance costs | (81) | (72) | (80)
Profit before tax | 485 | 656 | 632
Tax | (133) | (115) | (173)
Profit for the year | 352 | 541 | 459
Exceptional items [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Operating profit | (104) | 4 | (29)
Profit before tax | (104) | 4 | (29)
Tax | 27 | 88 | 12
Reportable segments [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Revenue | 1,933 | 1,730 | 1,667
Reportable segments [member] | Before exceptional items [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Operating profit | 816 | 758 | 706
System Fund [member] | Before exceptional items [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Operating profit | (146) | (34) | 35
Americas [member] | Reportable segments [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Revenue | 1,051 | 999 | 969
Americas [member] | Reportable segments [member] | Before exceptional items [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Operating profit | 662 | 637 | 626
EMEAA [member] | Reportable segments [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Revenue | 569 | 457 | 439
EMEAA [member] | Reportable segments [member] | Before exceptional items [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Operating profit | 202 | 171 | 157
Greater China [member] | Reportable segments [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Revenue | 143 | 117 | 112
Greater China [member] | Reportable segments [member] | Before exceptional items [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Operating profit | 69 | 52 | 46
Central [member] | Reportable segments [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Revenue | 170 | 157 | 147
Central [member] | Reportable segments [member] | Before exceptional items [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Operating profit | $ (117) | $ (102) | $ (123)

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