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Property and Equipment, Net Property and Equipment, Net (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 1,015	$ 1,034
Less: accumulated depreciation	(698)	(692)
Property and equipment, net	317	342	$ 304
Depreciation and amortization expense	109	102	$ 98
Furniture, fixtures and equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	188	193
Capitalized software
Property, Plant and Equipment [Line Items]
Property and equipment, gross	444	451
Finance lease assets
Property, Plant and Equipment [Line Items]
Property and equipment, gross	80	80
Building and leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	300	307
Land
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 3	$ 3

X

- Definition

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 depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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