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Goodwill and Other Intangible Assets - Summary of Terminal Growth Rates and Discount Rates Used in Impairment Tests (Detail) | Dec. 31, 2018 | Dec. 31, 2017
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Americas Managed [member] |  |
Disclosure of information for cash-generating units [Line Items] |  |
Terminal growth rate | 2.00% | 2.00%
Discount rate | 10.50% | 10.40%
Americas franchised [member] |  |
Disclosure of information for cash-generating units [Line Items] |  |
Terminal growth rate | 2.00% | 2.00%
Discount rate | 9.60% | 9.40%
Europe Middle East Asia and Africa Europe managed [member] |  |
Disclosure of information for cash-generating units [Line Items] |  |
Terminal growth rate | 2.00% | 2.00%
Discount rate | 11.40% | 10.80%
Europe Middle East Asia and Africa Europe franchised [member] |  |
Disclosure of information for cash-generating units [Line Items] |  |
Terminal growth rate | 2.00% | 2.00%
Discount rate | 10.50% | 9.80%
Europe Middle East Asia and Africa rest of region [member] |  |
Disclosure of information for cash-generating units [Line Items] |  |
Terminal growth rate | 3.50% | 3.50%
Discount rate | 13.40% | 14.10%
Greater China [member] |  |
Disclosure of information for cash-generating units [Line Items] |  |
Terminal growth rate | 2.50% | 2.50%
Discount rate | 12.30% | 13.60%

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