Schedule III - Real Estate and Accumulated Depreciation - Change in Accumulated Depreciation (Detail) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation Disclosure [Abstract]
Balance at beginning of period		$ 2,241	$ 2,038	$ 2,011
Additions during period:
Depreciation expense		280	294	256
Transfer to real estate assets	[1]	30
Deductions during period:
Transfers to assets held for sale				(24)
Dispositions Including Casualty Losses		(47)	(89)	(206)
Foreign exchange effect			(2)	1
Balance at end of period		$ 2,504	$ 2,241	$ 2,038

[1] During 2021, management of the Select Hotels was transitioned to a third-party hotel management company.