Acquisitions and Dispositions - Schedule of Unaudited Condensed Pro-forma Financial Information (Detail) - Chesapeake Lodging Trust [Member] - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Business Acquisition [Line Items]
Total revenues	$ 797	$ 800	$ 2,440	$ 2,477
Operating income	63	112	350	483
Net income	$ 23	$ 70	$ 227	$ 460