Acquisitions (Break-up of Purchase Price Allocation) (Details) - USD ($) $ in Millions		11 Months Ended		12 Months Ended
	Oct. 11, 2013	Jan. 01, 2016	Jan. 02, 2015	Jan. 30, 2015	Jan. 31, 2014
Business Acquisition [Line Items]
Forgiveness of accounts receivable (net of $32 million bad debt expense)		$ 0	$ 0	$ 0	$ 105
Plainfield Renewal Energy Holdings LLC
Business Acquisition [Line Items]
Forgiveness of accounts receivable (net of $32 million bad debt expense)	$ 105
Contingent consideration	6
Total purchase consideration	$ 111