Acquisitions and Acquisition-Related Items, Contingent Consideration (Details) (USD $) In Millions, unless otherwise specified			3 Months Ended		9 Months Ended			9 Months Ended						9 Months Ended
	Jan. 25, 2013	Apr. 27, 2012	Jan. 25, 2013 Level 3	Jan. 27, 2012 Level 3	Jan. 25, 2013 Level 3	Jan. 27, 2012 Level 3	Jan. 25, 2013 Recurring Level 3 Revenue-based Payments Discounted Cash Flow	Jan. 25, 2013 Recurring Level 3 Product Development-based Payments	Jan. 25, 2013 Recurring Level 3 Product Development-based Payments Discounted Cash Flow	Jan. 25, 2013 Other Long-term Liabilities	Apr. 27, 2012 Other Long-term Liabilities	Jan. 25, 2013 Other Accrued Expenses	Apr. 27, 2012 Other Accrued Expenses	Jan. 25, 2013 Minimum Recurring Level 3 Revenue-based Payments	Jan. 25, 2013 Maximum Recurring Level 3 Revenue-based Payments
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Estimated maximum potential amount of undiscounted future contingent consideration	$ 223
Fair Value Inputs
Discount rate								5.90%						13.00%	24.00%
Probability of payment								100.00%						95.00%	100.00%
Projected fiscal year of payment								2016						2013	2019
Reconciliation of Beginning and Ending Balances of Contingent Milestone Payments Associated with Acquisitions
Beginning Balance	141	231	213	288	231	335	137		4	122	200	19	31
Purchase price contingent consideration			0	0	5	2
Contingent milestone payments			(2)	0	(28)	(66)
Change in fair value of contingent consideration			(70)	15	(67)	32
Ending Balance	$ 141	$ 231	$ 141	$ 303	$ 141	$ 303	$ 137		$ 4	$ 122	$ 200	$ 19	$ 31