Property, Plant and Equipment (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Apr. 01, 2016	Dec. 30, 2016
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 527		$ 541
Less: accumulated depreciation and amortization	(289)		(282)
Property, plant and equipment, net	238		259
Depreciation	13	$ 7
Computers and other equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	193		172
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	165		161
Buildings and improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	62		104
Office furniture and fixtures
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	41		35
Land
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	52		57
Construction in progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 14		$ 12