Debt (Short-term and Commercial Paper Programs) (Details) (USD $)	12 Months Ended
	Jan. 29, 2012	Jan. 30, 2011
Short-term Debt [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 2,000,000,000
Credit facility expiration date	July 2013
Commercial Paper	0	0
Maximum amount outstanding at any month-end	828,000,000	0
Average daily short-term borrowings	44,000,000	5,000,000
Weighted average interest rate	0.50%	0.40%
Commercial Paper [Member]
Short-term Debt [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 2,000,000,000