Supplemental Disclosure of Noncash Investing and Financing Activities (Host Hotels & Resorts, Inc) - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	9 Months Ended		1 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Mar. 31, 2013 Exchangeable Senior Debentures 3.25%
Other Significant Noncash Transactions [Line Items]
Shares issued for converted units, shares	0.2	0.2
Redemptions of limited partner interests for common stock	$ 4	$ 3
Exchangeable Debentures			$ 174
Debt interest rate			3.25%
Debt converted into shares of Host Inc. common stock			11.7