Fair Value Measurements (Narrative) (Details) (USD $)	9 Months Ended
	Oct. 28, 2012	Oct. 30, 2011	Jan. 29, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Goodwill Impairment	$ 97,000,000	$ 0
Carrying value of senior notes	10,300,000,000		10,300,000,000
Senior Loans [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term Debt, Fair Value	$ 12,600,000,000		$ 12,100,000,000