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Investment in HD Supply Holdings, Inc. (Narrative) (Details) - HD Supply Inc [Member] - USD ($) shares in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Jan. 31, 2016 | 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 | $ 323,000,000 |  |

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