Composition of our Property and Equipment Balances (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 2,378	$ 2,448
Accumulated depreciation	(918)	(905)
Property and equipment, net	1,460	1,543
Land
Property, Plant and Equipment [Line Items]
Property and equipment, gross	457	535
Buildings and leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	781	786
Furniture and equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	775	789
Construction in progress
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 365	$ 338