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Segmental Information - Summary of Information by Reportable Segment - Result (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disclosure of reportable segments [line items] |  |  |
System Fund revenues | $ 928 | $ 765 | $ 1,373
Reimbursement of costs | 589 | 637 | 1,171
Revenue | 2,907 | 2,394 | 4,627
Operating profit | 494 | (153) | 630
Net financial expenses | (139) | (140) | (115)
Fair value gains on contingent purchase consideration | 6 | 13 | 27
Profit/(loss) before tax | 361 | (280) | 542
Tax | (96) | 20 | (156)
Profit/(loss) for the year | 265 | (260) | 386
Exceptional items [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Operating profit | (29) | (270) | (186)
Fair value gains on contingent purchase consideration | 0 | 21 | 38
Profit/(loss) before tax | (29) | (263) | (148)
Tax | 29 | 52 | 20
Reportable segments [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Revenue | 1,390 | 992 | 2,083
Reportable segments [member] | Before exceptional items [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Operating profit | 534 | 219 | 865
System Fund [member] | Before exceptional items [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Operating profit | (11) | (102) | (49)
Americas [member] | Exceptional items [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Operating profit | (22) | (118) | (62)
Americas [member] | Reportable segments [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Revenue | 774 | 512 | 1,040
Americas [member] | Reportable segments [member] | Before exceptional items [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Operating profit | 559 | 296 | 700
EMEAA [member] | Exceptional items [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Operating profit | (7) | (128) | (109)
EMEAA [member] | Reportable segments [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Revenue | 303 | 221 | 723
EMEAA [member] | Reportable segments [member] | Before exceptional items [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Operating profit | 5 | (50) | 217
Greater China [member] | Exceptional items [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Operating profit | 0 | (5) |
Greater China [member] | Reportable segments [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Revenue | 116 | 77 | 135
Greater China [member] | Reportable segments [member] | Before exceptional items [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Operating profit | 58 | 35 | 73
Central [member] | Exceptional items [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Operating profit | 0 | (19) | (15)
Central [member] | Reportable segments [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Revenue | 197 | 182 | 185
Central [member] | Reportable segments [member] | Before exceptional items [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Operating profit | $ (88) | $ (62) | $ (125)

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