Properties and Equipment, Net (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 744	$ 726
Accumulated depreciation and amortization	(542)	(496)
Properties and equipment, net	202	230
Depreciation and amortization	60	59	$ 58
Land [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	8	8
Buildings and improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	594	578
Furniture and equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 142	$ 140