Property and Equipment (Tables)

12 Months Ended

Dec. 31, 2016

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment [Table Text Block]

Property and equipment consisted of the following as of December 31, 2016 and 2015 (in millions, except years):

	As of December 31,						Depreciation Period (Years)
	2016			2015
Software and internally developed software	$	600		$	474		1 to 8
Computer and network equipment	483			410			1 to 5
Land	136			138			N/A
Buildings and building improvements	259			188			2.5 to 40
Leasehold improvements	216			216			1 to 17
Equipment, aircraft and office furniture	242			197			1 to 15
	1,936			1,623
Less accumulated depreciation and amortization	(807		)	(586		)
Property and equipment, net	$	1,129		$	1,037