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Property, Equipment and Intangible Assets (Property And Equipment) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Property, Equipment and Intangible Assets [Abstract]
Leasehold improvements	$ 9	$ 7
Computer equipment	19	17
Office furniture and equipment	5	2
Property and equipment, gross	33	26
Less—accumulated depreciation and amortization	(13)	(12)
Property and equipment, net	20	14
Internally developed software	61	52
Intangible assets (acquired technology)		8
Less-accumulated amortization	(28)	(31)
Intangible assets, net	33	29
Total property equipment and intangible assets, net	$ 53	$ 43

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- Definition

total property, equipment and intangible assets net of accumulated depreciation and amortization

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Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Amount before accumulated amortization of capitalized costs for computer software, including but not limited to, acquired and internally developed computer software.

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Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount before accumulated depreciation of equipment commonly used in offices and stores that have no permanent connection to the structure of a building or utilities. Examples include, but are not limited to, desks, chairs, tables, and bookcases.

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Amount before accumulated depreciation of additions or improvements to assets held under a lease arrangement.

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Amount before accumulated depreciation of tangible personal property used to produce goods and services, including, but is not limited to, tools, dies and molds, computer and office equipment.

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