Discontinued Operations - Summary of Hotel Franchise and Hotel Management Business Presented as Discontinued Operations (Detail) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
OTHER EXPENSES:
Loss on extinguishment of debt		$ (10)
Income (loss) from Discontinued Operations, net of tax	$ 3	(25)	$ (3)
Discontinued Operations [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
FRANCHISE AND OTHER FEE BASED REVENUES	42	58	111
OPERATING EXPENSES
Corporate, general, administrative and marketing	28	64	86
Depreciation and amortization	2	4	6
Total Operating Expenses	30	68	92
Operating Income (Loss)	12	(10)	19
OTHER EXPENSES:
Interest expense	(8)	(15)	(25)
Loss on extinguishment of debt		(7)
Total Other Expenses	(8)	(22)	(25)
Income (loss) Before Income Taxes	4	(32)	(6)
Income tax benefit (expense), primarily current	(1)	7	3
Income (loss) from Discontinued Operations, net of tax	$ 3	$ (25)	$ (3)