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Investment in HD Supply Holdings, Inc. (Narrative) (Details) - HD Supply Inc [Member] - USD ($) | 12 Months Ended |
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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 |

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