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Goodwill and Other Intangible Assets - Summary of Carrying Value of Goodwill and Indefinite Life Brands Allocated to Cash-generating Units for Impairment Testing (Detail) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Disclosure of information for cash-generating units [Line Items] |  |
Goodwill | $ 313 | $ 237
Brands | 250 | 193
Americas Managed [member] |  |
Disclosure of information for cash-generating units [Line Items] |  |
Goodwill | 69 | 63
Brands | 203 | 193
Americas franchised [member] |  |
Disclosure of information for cash-generating units [Line Items] |  |
Goodwill | 37 | 37
Brands | 0 |
Europe Middle East Asia and Africa Europe managed [member] |  |
Disclosure of information for cash-generating units [Line Items] |  |
Goodwill | 29 | 21
Brands | 13 |
Europe Middle East Asia and Africa Europe franchised [member] |  |
Disclosure of information for cash-generating units [Line Items] |  |
Goodwill | 10 | 10
Brands | 0 |
Europe Middle East Asia and Africa rest of region [member] |  |
Disclosure of information for cash-generating units [Line Items] |  |
Goodwill | 113 | 106
Brands | 23 |
Greater China [member] |  |
Disclosure of information for cash-generating units [Line Items] |  |
Goodwill | 7 |
Brands | 11 |
UK Leased portfolio [member] |  |
Disclosure of information for cash-generating units [Line Items] |  |
Goodwill | 48 |
Brands | 0 |
Cash-generating units [member] |  |
Disclosure of information for cash-generating units [Line Items] |  |
Goodwill | 265 | 237
Brands | $ 250 | $ 193

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