Business Segment Information - Schedule of Total Assets by Consolidated Hotels, Reconciled To Total Assets (Detail) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Segment Reporting Asset Reconciling Item [Line Items]
Total assets	$ 10,434	$ 10,587
Consolidated Hotels [Member]
Segment Reporting Asset Reconciling Item [Line Items]
Total assets	10,415	10,568
All Other [Member]
Segment Reporting Asset Reconciling Item [Line Items]
Total assets	$ 19	$ 19