Business Segment Information - Schedule of Total Assets by Consolidated Hotels, Reconciled To Condensed Combined Consolidated Amounts (Detail) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Segment Reporting Asset Reconciling Item [Line Items]
Total assets	$ 9,336	$ 9,714
Consolidated Hotels [Member]
Segment Reporting Asset Reconciling Item [Line Items]
Total assets	9,241	9,623
All other [Member]
Segment Reporting Asset Reconciling Item [Line Items]
Total assets	$ 95	$ 91