Business Segment Information - Schedule of Total Assets by Consolidated Hotels, Reconciled To Condensed Combined Consolidated Amounts (Detail) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	$ 9,803	$ 9,834
Consolidated Hotels [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	9,710	9,747
All other [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	$ 93	$ 87