Fair Value Measurements - Additional Information (Detail) - Level 2 - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
W New York
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Impairment expense	$ 8	$ 43
W NewYork - Union Square
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Impairment expense	13
Westin New York Grand Central
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Impairment expense	23
Fair value, net of selling cost	270
Sheraton New York Times Square Hotel
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Impairment expense	216
Fair value of property, following the impairment loss	$ 495