ACQUISITIONS AND DISPOSITIONS - Acquisitions (Details) $ in Millions		12 Months Ended
	Dec. 09, 2019 USD ($) hotel	Dec. 31, 2019 USD ($)
Elegant Hotels Group plc
Schedule of Asset Acquisition [Line Items]
Offer for issued and to be issued share capital	$ 128
Debt assumed	$ 63
Number of hotels acquired | hotel	7
W New York - Union Square
Schedule of Asset Acquisition [Line Items]
Property purchased		$ 206
Brands | AC Hotels by Marriott
Schedule of Asset Acquisition [Line Items]
Indefinite lived intangible assets acquired		$ 156
Management and Franchise Contracts | AC Hotels by Marriott
Schedule of Asset Acquisition [Line Items]
Finite lived intangible assets term		24 years
Finite lived intangible assets acquired		$ 34