Non-Controlling Interests - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014 Entity	Sep. 30, 2013	Sep. 30, 2014 Entity	Sep. 30, 2013	Dec. 31, 2013
Minority Interest [Line Items]
Number of majority-owned partnerships that have third-party, non-controlling ownership interests that have been consolidated	6		6
Non-controlling interests—other consolidated partnerships	$ 35		$ 35		$ 34
Number of majority-owned partnerships that have third-party, non-controlling ownership interests with finite lives	2		2
Non-controlling interests in outside partnerships, fair value	70		70		68
Net income attributable to non-controlling interests outside partnerships	(1)	(1)	4	2
Net income	$ 2		$ 7	$ 3
HOST HOTELS & RESORTS L.P.
Minority Interest [Line Items]
OP units conversion basis			One common OP unit may be exchanged into 1.021494 shares of Host Inc
Shares issuable upon conversion of one OP unit	1.021494		1.021494		1.021494
Lower Limit
Minority Interest [Line Items]
Majority-owned partnerships with mandatorily redeemable non-controlling interests, termination year			2081
Upper Limit
Minority Interest [Line Items]
Majority-owned partnerships with mandatorily redeemable non-controlling interests, termination year			2095