Non-Controlling Interests - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013 Entity	Sep. 07, 2012	Sep. 07, 2012	Sep. 30, 2013 Entity	Dec. 31, 2012
Minority Interest [Line Items]
Number of majority-owned partnerships that have third-party, non-controlling ownership interests that have been consolidated	5			5
Non-controlling interests in outside partnerships	$ 36			$ 36	$ 34
Number of majority-owned partnerships that have third-party, non-controlling ownership interests with finite lives	3			3
Non-controlling interests in outside partnerships, fair value	71			71	65
Net income	(1)	(1)	1	2
Net income		$ (1)	$ 1	$ 3
Lower Limit
Minority Interest [Line Items]
Majority-owned partnerships with mandatorily redeemable non-controlling interests, termination year	2081			2081
Upper Limit
Minority Interest [Line Items]
Majority-owned partnerships with mandatorily redeemable non-controlling interests, termination year	2095			2095
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. common stock.