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Investment in HD Supply Holdings, Inc. (Narrative) (Details) - HD Supply Inc [Member] - USD ($)
12 Months Ended
Jan. 31, 2016
Jan. 31, 2010
Schedule of Cost-method Investments [Line Items]    
Cost Method Investments, Cost Basis   $ 0
Interest And Investment Income [Member]    
Schedule of Cost-method Investments [Line Items]    
Cost Method Investments, Realized Gains $ 144,000,000