Composition of our Property and Equipment Balances (Detail) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 1,926	$ 2,378
Accumulated depreciation	(897)	(918)
Property and equipment, net	1,029	1,460
Land
Property, Plant and Equipment [Line Items]
Property and equipment, gross	299	457
Buildings and leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	729	781
Furniture and equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	768	775
Construction in progress
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 130	$ 365