Property Plant and Equipment (Details) - USD ($) $ in Millions	1 Months Ended	11 Months Ended	12 Months Ended
	Dec. 31, 2015	Jan. 01, 2016	Jan. 30, 2015	Jan. 31, 2014
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross		$ 414	$ 621
Less accumulated depreciation and amortization		(272)	(313)
Property, plant and equipment, net		142	308
Depreciation		33	47	$ 45
Property, Plant and Equipment, Disposals	$ 40	40
Electric generation facility
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross		0	127
Computers and other equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross		161	166
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross		149	156
Buildings and improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross		57	107
Property, Plant and Equipment, Disposals		29
Office furniture and fixtures
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross		30	37
Land
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross		15	26
Property, Plant and Equipment, Disposals		10
Construction in progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross		$ 2	$ 2