Property and Equipment - Schedule of Property and Equipment (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 2,507	$ 2,276
Less accumulated depreciation and amortization	(1,266)	(1,030)
Property and equipment, net	1,241	1,246
Software and internally developed software
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 919	766
Software and internally developed software \| Minimum
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	3 years
Software and internally developed software \| Maximum
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	7 years
Computer and network equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 682	575
Computer and network equipment \| Minimum
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	3 years
Computer and network equipment \| Maximum
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	5 years
Land
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 145	137
Buildings and building improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 294	289
Buildings and building improvements \| Minimum
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	15 years
Buildings and building improvements \| Maximum
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	40 years
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 242	234
Leasehold improvements \| Minimum
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	4 years
Leasehold improvements \| Maximum
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	12 years
Equipment, aircraft and office furniture
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 225	$ 275
Equipment, aircraft and office furniture \| Minimum
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	4 years
Equipment, aircraft and office furniture \| Maximum
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	15 years

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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