Derivative Financial Instruments (Details) (USD $) In Millions, unless otherwise specified				3 Months Ended	9 Months Ended
Oct. 27, 2012 instrument	Jan. 28, 2012	Oct. 29, 2011 instrument	Oct. 27, 2012 Interest rate swaps	Oct. 29, 2011 Interest rate swaps	Oct. 27, 2012 Interest rate swaps	Oct. 29, 2011 Interest rate swaps
Derivative Contracts - Effect on Results of Operations
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net				$ 12	$ 10	$ 32	$ 32
Unamortized hedged debt valuation gains from terminated and de-designated interest rate swaps	$ 84	$ 111	$ 122
Number of derivative instruments designated as accounting hedge	1		1

Amount as of the balance sheet date of the unamortized adjustment to the carrying value of an interest-bearing hedged item made under an effective interest rate fair value hedge that is amortized upon discontinuation of the interest rate fair value hedge.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 25

-Section 35

-Paragraph 9

-URI http://asc.fasb.org/extlink&oid=6439857&loc=d3e75592-113984

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 24

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant