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Fair Value Disclosures (REIT Assets Measured on Recurring Basis) (Details) (USD $)
In Millions, unless otherwise specified |
Jul. 28, 2012
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Jan. 28, 2012
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Jul. 30, 2011
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Fair Value, Inputs, Level 1 [Member]
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| REIT assets | $ 71 | $ 336 | $ 300 |
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Fair Value, Inputs, Level 2 [Member]
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| REIT assets | |||
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Fair Value, Inputs, Level 3 [Member]
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| REIT assets |