Investment in HD Supply Holdings, Inc. (Narrative) (Details) - HD Supply Inc [Member] - USD ($) shares in Millions	3 Months Ended	6 Months Ended	12 Months Ended
	Aug. 02, 2015	Aug. 03, 2014	Feb. 01, 2015	Feb. 02, 2014	Jan. 31, 2010
Schedule of Cost-method Investments [Line Items]
Cost Method Investments, Common Stock Shares Owned				16.3
Cost Method Investment, Ownership Percentage				8.00%
Cost Method Investments, Cost Basis					$ 0
Cost Method Investments, Common Stock Shares Sold	4.1		12.2
Interest And Investment Income [Member]
Schedule of Cost-method Investments [Line Items]
Cost Method Investments, Realized Gains	$ 144,000,000	$ 212,000,000	$ 323,000,000