Income Tax Provision Calculated at Statutory U.S. Federal Income Tax Rate and Actual Income Tax Provision Recorded (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Statutory federal income tax provision – continuing operations	$ 204	$ 265	$ 81
Adjustment for nontaxable income of Host Inc. – continuing operations	(203)	(268)	(77)
State income tax provision, net	1	1	5
Provision for uncertain tax positions	1	5	2
Foreign income tax provision	6	11	10
Income tax provision – continuing operations	$ 9	$ 14	$ 21