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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