Properties and Equipment, Net (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 772	$ 762
Accumulated depreciation and amortization	(614)	(577)
Properties and equipment, net	158	185
Depreciation and amortization	44	51	$ 60
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	619	609
Furniture and equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 145	$ 145