Supplemental Disclosure of Noncash Investing and Financing Activities - Additional Information (Detail) In Millions, unless otherwise specified		9 Months Ended						1 Months Ended			1 Months Ended	9 Months Ended						1 Months Ended			1 Months Ended			1 Months Ended
	Jun. 17, 2011	Sep. 09, 2011 HOST HOTELS & RESORTS, INC. USD ($)	Sep. 10, 2010 HOST HOTELS & RESORTS, INC. USD ($)	Mar. 17, 2011 HOST HOTELS & RESORTS, INC. Manchester Grand Hyatt San Diego Room	Mar. 17, 2011 HOST HOTELS & RESORTS, INC. Manchester Grand Hyatt San Diego Common Units USD ($)	Apr. 29, 2011 HOST HOTELS & RESORTS, INC. Hilton Melbourne South Wharf USD ($) Room	Apr. 29, 2011 HOST HOTELS & RESORTS, INC. Hilton Melbourne South Wharf AUD	Jun. 28, 2011 HOST HOTELS & RESORTS, INC. European Joint Venture Le Meridien Piccadilly USD ($)	Jun. 28, 2011 HOST HOTELS & RESORTS, INC. European Joint Venture Le Meridien Piccadilly GBP (£)	Jun. 28, 2011 HOST HOTELS & RESORTS, INC. European Joint Venture Secondary Fund	Jun. 30, 2011 HOST HOTELS & RESORTS, INC. Exchangeable Senior Debentures 3.25 Percent USD ($)	Sep. 09, 2011 HOST HOTELS & RESORTS L.P. USD ($)	Sep. 10, 2010 HOST HOTELS & RESORTS L.P. USD ($)	Mar. 17, 2011 HOST HOTELS & RESORTS L.P. Manchester Grand Hyatt San Diego Room	Mar. 17, 2011 HOST HOTELS & RESORTS L.P. Manchester Grand Hyatt San Diego Common Units USD ($)	Apr. 29, 2011 HOST HOTELS & RESORTS L.P. Hilton Melbourne South Wharf USD ($) Room	Apr. 29, 2011 HOST HOTELS & RESORTS L.P. Hilton Melbourne South Wharf AUD	Jun. 28, 2011 HOST HOTELS & RESORTS L.P. European Joint Venture Le Meridien Piccadilly USD ($)	Jun. 28, 2011 HOST HOTELS & RESORTS L.P. European Joint Venture Le Meridien Piccadilly GBP (£)	Jun. 28, 2011 HOST HOTELS & RESORTS L.P. European Joint Venture Secondary Fund	Jun. 30, 2011 HOST HOTELS & RESORTS L.P. Exchangeable Senior Debentures 3.25 Percent USD ($)	Jun. 17, 2011 Manchester Grand Hyatt San Diego Room	Jun. 17, 2011 Hilton Melbourne South Wharf Room	Jun. 28, 2011 European Joint Venture Le Meridien Piccadilly USD ($)	Jun. 28, 2011 European Joint Venture Le Meridien Piccadilly GBP (£)	Jun. 30, 2011 Exchangeable Senior Debentures 3.25 Percent USD ($)	May 27, 2011 Exchangeable Senior Debentures 3.25 Percent
Schedule of Cash Flow, Supplemental [Line Items]
Shares issued for converted units, shares		0.2	1.1									0.2	1.1
Value of shares issued		$ 4	$ 12
Ownership percentage acquired	25.00%					75.00%	75.00%									75.00%	75.00%
Mortgage debt at fair value, premium						0.5										0.5
Mortgage debt assumed in connection with acquisition						86	80									86	80
Number of rooms				1,625		364	364							1,625		364	364					1,625	364
OP Units exchanged for ownership right, units					300,000										300,000
OP Units exchanged for ownership right, value per unit					18.741										18.741
OP Units exchanged for ownership right, value					6										6
Property transfer price								102	64									102	64					102	64
Mortgage debt assumed								52	32									52	32					52	32
Capital lease transferred								61	38									61	38					61	38
Proceeds from transfer of Le Meridien Piccadilly to the Euro JV Fund II		40						40	25			40						40	25
Host's limited partner interest										33.40%										33.40%
Value of debentures converted to equity											134										134					134
Debt interest rate											3.25%										3.25%						3.25%
Debt converted into shares of Host Inc. common stock											8.8										8.8					8.8
Common operating partnership units, value												$ 4	$ 12