Summary of Results of Operations for Eight Hotels Sold in Twenty Fifteen and Five Hotels Sold in Twenty Fourteen which are Included in Continuing Operations (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Discontinued Operations And Disposal Groups [Abstract]
Revenues	$ 60	$ 197
Income before taxes	5	12
Gain on disposals	$ 89	$ 229