Patent Cross License Agreement (Details) (USD $)	12 Months Ended
	Jan. 27, 2013	Jan. 29, 2012	Jan. 30, 2011
Notes to financial statements [Abstract]
Patent Cross Licensing Agreement Term	6
Total Cash Consideration Received			$ 1,500,000,000
Legal Settlement	0	0	(57,000,000)
Intel License Fair Value Revenue			1,583,000,000
Intel License Fair Value Cost Charged Per Quarter	66,000,000
License from Intel			(140,000,000)
Total Consideration Installments Year One Through Year Three	300,000,000
Total Consideration Installments Year Four Through Year Six			200,000,000
Revenue recognized for performance obligation	264,000,000	220,000,000
License from Intel, cost of sales charge per quarter	5,000,000
Amortization expense recognized for license from Intel	$ 20,000,000	$ 16,700,000
Estimated useful life of the technology from the license from Intel (in years)			7