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Segmental Information - Summary of Information by Reportable Segment - Result (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of reportable segments [line items] |  |  |
System Fund revenues | $ 765 | $ 1,373 | $ 1,233
Reimbursement of costs | 637 | 1,171 | 1,171
Revenue | 2,394 | 4,627 | 4,337
Operating profit | (153) | 630 | 582
Net finance expenses | (140) | (115) | (96)
Fair value gains/(losses) on contingent purchase consideration | 13 | 27 | (4)
(Loss)/profit before tax | (280) | 542 | 482
Tax | 20 | (156) | (132)
(Loss)/profit for the year | (260) | 386 | 350
Exceptional items [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Operating profit | (270) | (186) | (104)
Fair value gains/(losses) on contingent purchase consideration | 21 | 38 |
(Loss)/profit before tax | (263) | (148) | (104)
Tax | (52) | (20) | (27)
Reportable segments [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Revenue | 992 | 2,083 | 1,933
Reportable segments [member] | Before exceptional items [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Operating profit | 219 | 865 | 832
System Fund [member] | Before exceptional items [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Operating profit | (102) | (49) | (146)
Americas [member] | Exceptional items [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Operating profit | (118) | (62) | (36)
Americas [member] | Reportable segments [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Revenue | 512 | 1,040 | 1,051
Americas [member] | Reportable segments [member] | Before exceptional items [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Operating profit | 296 | 700 | 673
EMEAA [member] | Exceptional items [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Operating profit | (128) | (109) | (12)
EMEAA [member] | Reportable segments [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Revenue | 221 | 723 | 569
EMEAA [member] | Reportable segments [member] | Before exceptional items [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Operating profit | (50) | 217 | 206
Greater China [member] | Exceptional items [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Operating profit | (5) |  | (1)
Greater China [member] | Reportable segments [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Revenue | 77 | 135 | 143
Greater China [member] | Reportable segments [member] | Before exceptional items [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Operating profit | 35 | 73 | 70
Central [member] | Exceptional items [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Operating profit | (19) | (15) | (55)
Central [member] | Reportable segments [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Revenue | 182 | 185 | 170
Central [member] | Reportable segments [member] | Before exceptional items [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Operating profit | $ (62) | $ (125) | $ (117)

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