Property and Equipment (Tables)

12 Months Ended

Dec. 31, 2018

Property, Plant and Equipment [Abstract]

Schedule of Property and Equipment

Property and equipment consisted of the following (in millions):

	As of December 31,						Depreciation Period (Years)
	2018			2017
Software and internally developed software	$	919		$	766		3 to 7
Computer and network equipment	682			575			3 to 5
Land	145			137			N/A
Buildings and building improvements	294			289			15 to 40
Leasehold improvements	242			234			4 to 12
Equipment, aircraft and office furniture	225			275			4 to 15
	2,507			2,276
Less accumulated depreciation and amortization	(1,266		)	(1,030		)
Property and equipment, net	$	1,241		$	1,246