PROPERTY AND EQUIPMENT - Composition of our Property and Equipment Balances (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 2,890	$ 3,320
Accumulated depreciation	(1,097)	(985)
Property and equipment, net	1,793	2,335
Land
Property, Plant and Equipment [Line Items]
Property and equipment, gross	601	654
Buildings and leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	1,052	1,352
Furniture and equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	1,121	1,159
Construction in progress
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 116	$ 155