Property and Equipment, Net Property and Equipment, Net (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 1,044	$ 1,044
Less: accumulated depreciation	(764)	(727)
Property and equipment, net	280	317	$ 310
Depreciation and amortization expense	106	118	$ 110
Furniture, fixtures and equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	146	174
Capitalized software
Property, Plant and Equipment [Line Items]
Property and equipment, gross	530	492
Finance lease assets
Property, Plant and Equipment [Line Items]
Property and equipment, gross	81	85
Building and leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	285	290
Land
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 2	$ 3