Patent Cross License Agreement (Details) (USD $)	12 Months Ended
	Jan. 29, 2012	Jan. 30, 2011
Notes to financial statements [Abstract]
Patent Cross Licensing Agreement Term		6
Total consideration receivable in annual installments on January 18, 2011, January 13, 2012 and January 15, 2013	$ 300,000,000
Total consideration receivable in annual installments on January 15, 2014, 2015 and 2016		200,000,000
Litigation Settlement		(57,000,000)
License to Intel		1,583,000,000
License from Intel		(140,000,000)
Total cash consideration		1,500,000,000
License to Intel, revenue recognized per quarter		66,000,000
Revenue recognized for performance obligation	220,000,000
License from Intel, cost of sales charge per quarter		5,000,000
Amortization expense recognized for license from Intel	$ 16,700,000
Estimated useful life of the technology from the license from Intel (in years)		7