Fair Value Measurements and Concentrations of Credit Risk (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Jan. 28, 2012	Jan. 29, 2011	Jan. 30, 2010
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Carrying value of long-lived assets held and used	$ 27	$ 36
Long-lived assets held and used	5	18
Impairments of properties held and used	$ 22	$ 18	$ 115

The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale).

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+ Details