Income Tax Provision (Benefit) Calculated at Statutory U.S. Federal Corporate Income Tax Rate and Actual Income Tax Provision (Benefit) Recorded (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Statutory federal income tax provision (benefit)	$ (202)	$ 202	$ 273
Adjustment for nontaxable (income) loss of Host Inc.	34	(182)	(192)
Adjustment for net operating loss carryback to 2017-2019	18
State income tax provision (benefit), net	(62)	7	31
Change to uncertain tax provision	(3)	(3)
Foreign income tax provision (benefit)	(5)	6	38
Income tax provision (benefit) – continuing operations	$ (220)	$ 30	$ 150