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. 24, 2014	Jan. 25, 2013	Jan. 24, 2014	Jan. 25, 2013	Jan. 24, 2014 Recurring Level 3	Apr. 26, 2013 Recurring Level 3	Jan. 24, 2014 Other Long-term Liabilities	Apr. 26, 2013 Other Long-term Liabilities	Jan. 24, 2014 Other Accrued Expenses	Apr. 26, 2013 Other Accrued Expenses	Jan. 24, 2014 Product Development Milestone [Member] Recurring Level 3 Discounted Cash Flow	Jan. 24, 2014 Product Development Milestone [Member] Minimum Recurring Level 3	Jan. 24, 2014 Product Development Milestone [Member] Maximum Recurring Level 3	Jan. 24, 2014 Revenue-based Payments Recurring Level 3	Jan. 24, 2014 Revenue-based Payments Recurring Level 3 Discounted Cash Flow	Jan. 24, 2014 Revenue-based Payments Minimum Recurring Level 3	Jan. 24, 2014 Revenue-based Payments Maximum Recurring Level 3	Jan. 24, 2014 Business combinations or purchases of intellectual property prior to April 24, 2009 [Member]
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High																		$ 199
Fair Value Inputs
Discount rate												5.50%	5.90%			13.50%	24.00%
Business Combination, Contingent Consideration, Liability	66	141	66	141	66	142	56	120	10	22	29				37
Probability of payment												75.00%	100.00%	100.00%
Projected fiscal year of payment												2017	2018			2014	2019
Reconciliation of Beginning and Ending Balances of Contingent Milestone Payments Associated with Acquisitions
Beginning Balance	45	213	142	231	66	142	56	120	10	22	29				37
Purchase price contingent consideration	60	0	60	5
Contingent milestone payments	0	(2)	(1)	(28)
Change in fair value of contingent consideration	(39)	(70)	(135)	(67)
Ending Balance	$ 66	$ 141	$ 66	$ 141	$ 66	$ 142	$ 56	$ 120	$ 10	$ 22	$ 29				$ 37