Business Segment Information - Schedule of Total Assets by Consolidated Hotels, Reconciled To Total Assets (Detail) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Segment Reporting Asset Reconciling Item [Line Items]
Total assets	$ 10,853	$ 11,290
Consolidated Hotels [Member]
Segment Reporting Asset Reconciling Item [Line Items]
Total assets	10,828	11,236
All Other [Member]
Segment Reporting Asset Reconciling Item [Line Items]
Total assets	$ 25	$ 54