Supplemental Disclosure of Noncash Investing and Financing Activities (Host Hotels & Resorts, Inc) - Additional Information (Detail) (HOST HOTELS & RESORTS, INC., USD $) In Millions, unless otherwise specified	9 Months Ended		1 Months Ended
	Sep. 07, 2012	Sep. 30, 2013	Mar. 31, 2013 Exchangeable Senior Debentures 3.25%
Other Significant Noncash Transactions [Line Items]
Shares issued for converted units, shares	0.5	0.2
Common operating partnership units, value	$ 8	$ 3
Exchangeable Debentures			$ 174
Debt interest rate			3.25%
Debt converted into shares of Host Inc. common stock			11.7