Non-Controlling Interests - Additional Information (Detail) $ in Millions	3 Months Ended
	Mar. 31, 2017 USD ($) Entity	Mar. 31, 2016 USD ($)	Dec. 31, 2016 USD ($)
Minority Interest [Line Items]
Number of majority-owned partnerships that have third-party, non-controlling ownership interests that have been consolidated | Entity	4
Non-controlling interests—other consolidated partnerships	$ 40		$ 39
Number of majority-owned partnerships that have third-party, non-controlling ownership interests with finite lives | Entity	1
Majority-owned partnerships with mandatorily redeemable non-controlling interests, termination year	2095
Net income attributable to non-controlling interests outside partnerships	$ 1
Net income	$ 2	$ 2
HOST HOTELS & RESORTS L.P.
Minority Interest [Line Items]
OP units conversion basis	One common OP unit may be exchanged for 1.021494 shares of Host Inc
Shares issuable upon conversion of one OP unit	1.021494		1.021494