Dispositions - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	9 Months Ended		12 Months Ended	0 Months Ended	3 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013 Hotel	Oct. 01, 2014 Tampa Marriott Waterside Hotel And Marina Subsequent Event	Dec. 31, 2014 Tampa Marriott Waterside Hotel And Marina Subsequent Event	Mar. 31, 2014 Philadelphia Marriott Downtown	Mar. 31, 2014 Courtyard Nashua
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Proceeds from sales of assets, net	$ 274	$ 446		$ 199			$ 10
FF&E replacement fund retained at the hotel				9
Gain on sale of property					115
Percentage of controlling interest sold						89.00%
Gross sales price						$ 303
Number of properties sold			5