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Fair Value Measurements - Additional Information (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Oct. 27, 2012	Oct. 29, 2011	Oct. 27, 2012	Oct. 29, 2011
Fair Value Disclosures [Abstract]
Purchases, sales, issuances, or settlements related to recurring level 3 measurements	$ 0	$ 0	$ 0	$ 0
Transfers into or out of level 1	0	0	0	0
Transfers into or out of level 2	0	0	0	0
Money market funds		133		133
Goodwill impairment charges	0	0	0	0
Other indefinite-lived intangible assets impairment charges	0	0	0	0
Other long-lived asset impairment charges	$ 0	$ 0	$ 0	$ 0

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- Definition

Amount of transfers of assets measured on a recurring basis out of Level 1 of the fair value hierarchy into Level 2.

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Amount of transfers of assets measured on a recurring basis out of Level 2 of the fair value hierarchy into Level 1.

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Amount of purchases, sales, issues, and settlements in relation to liabilities measured at fair value on a recurring basis using unobservable inputs (level 3).

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Loss recognized during the period that results from the write-down of goodwill after comparing the implied fair value of reporting unit goodwill with the carrying amount of that goodwill. Goodwill is assessed at least annually for impairment.

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The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of an indefinite-lived intangible asset, other than goodwill, to fair value.

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Investment in short-term money-market instruments (such as commercial paper, banker's acceptances, repurchase agreements, government securities, certificates of deposit, and so forth) which are highly liquid (that is, readily convertible to known amounts of cash) and so near their maturity that they present an insignificant risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify as cash equivalents by definition. Original maturity means an original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months.

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The charge against earnings resulting from the write down of long lived assets other than goodwill due to the difference between the carrying value and lower fair value.

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