Property and Equipment, Net (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 128	$ 130
Accumulated depreciation and amortization	(57)	(53)
Properties and equipment, net	71	77
Depreciation and amortization expense for continuing operations	6	11	15
Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives of properties and equipment	3 years
Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives of properties and equipment	40 years
Land [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	3	3
Building and Building Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	99	101
Building and Building Improvements [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives of properties and equipment	10 years
Building and Building Improvements [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives of properties and equipment	40 years
Furniture and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 26	$ 26
Furniture and Equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives of properties and equipment	3 years
Furniture and Equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives of properties and equipment	10 years