Acquisitions and Dispositions - Additional Information (Detail) $ / shares in Units, shares in Millions, $ in Millions	1 Months Ended	3 Months Ended		9 Months Ended		21 Months Ended
	May 31, 2018 USD ($)	Sep. 30, 2019 USD ($) Hotel $ / shares	Sep. 30, 2018 USD ($) Hotel	Sep. 30, 2019 USD ($) Hotel $ / shares shares	Sep. 30, 2018 USD ($) Hotel	Sep. 30, 2019 USD ($) Hotel $ / shares	May 05, 2019 $ / shares
Business Acquisition [Line Items]
Acquisition costs		$ 59		$ 65
Operating income		38	$ 84	278	$ 407
Net income		$ 5	$ 52	$ 183	$ 418
Number of hotel portfolio properties sold | Hotel		5	12	5	12	5
Gross proceeds on sale of hotel portfolio properties				$ 236	$ 379
Net gain on selling cost of hotel portfolio properties				$ 20	98
Reclassification of currency translation adjustment from accumulated other comprehensive loss to earnings on disposition of hotel portfolio properties					$ 31
Hilton Berlin [Member]
Business Acquisition [Line Items]
Reclassification of currency translation adjustment from accumulated other comprehensive loss to earnings on disposition of hotel portfolio properties	$ 8
Gross proceeds on sale of hotel portfolio properties	375
Pro-rata share amount before customary closing adjustments	151
Net gain on sale of hotel portfolio properties	$ 107
Chesapeake Lodging Trust [Member]
Business Acquisition [Line Items]
Percentage of ownership interest in properties				100.00%
Total consideration				$ 2,000
Business acquisition, consideration transferred number of shares issued | shares				37.8
Business acquisition,par value per common share | $ / shares		$ 25.88		$ 25.88		$ 25.88	$ 0.01
Cash issued for acquisition				$ 1,013
Acquisition costs		$ 59		65
Revenue recognized						$ 23
Operating income						5
Net income						$ 4
Chesapeake Lodging Trust [Member] | Common Stock [member]
Business Acquisition [Line Items]
Shares issued for acquisition				$ 978