Income Tax Provision Calculated at Statutory U.S. Federal Corporate Income Tax Rate and Actual Income Tax Provision Recorded (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Statutory federal income tax provision	$ 202	$ 273	$ 228
Adjustment for nontaxable income of Host Inc.	(182)	(192)	(190)
State income tax provision, net	7	31	10
Change to uncertain tax position	(3)
Remeasurement of domestic net deferred tax assets			11
Foreign income tax provision	6	38	21
Income tax provision – continuing operations	$ 30	$ 150	$ 80