Geographic and Business Segment Information - Schedule of Total Assets by Consolidated Hotels, Reconciled To Condensed Consolidated Amounts (Detail) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Asset Reconciling Item [Line Items]
Total assets	$ 9,714	$ 9,834
Consolidated hotels [Member]
Segment Reporting Asset Reconciling Item [Line Items]
Total assets	9,623	9,747
All other [Member]
Segment Reporting Asset Reconciling Item [Line Items]
Total assets	$ 91	$ 87