Acquisitions and Acquisition-Related Items, Contingent Consideration (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended										6 Months Ended		6 Months Ended		6 Months Ended
	Oct. 24, 2014	Oct. 25, 2013	Oct. 24, 2014	Oct. 25, 2013	Oct. 24, 2014 Recurring	Apr. 25, 2014 Recurring	Oct. 24, 2014 Recurring Level 3	Apr. 25, 2014 Recurring Level 3	Oct. 24, 2014 Other Long-term Liabilities	Apr. 25, 2014 Other Long-term Liabilities	Oct. 24, 2014 Other Accrued Expenses	Apr. 25, 2014 Other Accrued Expenses	Oct. 24, 2014 Product Development Milestone [Member] Recurring Level 3	Oct. 24, 2014 Product Development Milestone [Member] Recurring Level 3 Discounted Cash Flow	Oct. 24, 2014 Revenue-based Payments Recurring Level 3	Oct. 24, 2014 Revenue-based Payments Recurring Level 3 Discounted Cash Flow	Oct. 24, 2014 Revenue-based Payments Minimum Recurring Level 3	Oct. 24, 2014 Revenue-based Payments Maximum Recurring Level 3	Oct. 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																			$ 197
Fair Value Inputs
Discount rate													5.50%				13.50%	24.00%
Contingent Consideration	91	45	91	45	91	68	91	68	66	51	25	17		26		65
Probability of payment													75.00%		100.00%
Projected fiscal year of payment													2018				2015	2019
Reconciliation of Beginning and Ending Balances of Contingent Milestone Payments Associated with Acquisitions
Beginning Balance	87	45	68	142	91	68	91	68	66	51	25	17		26		65
Purchase price contingent consideration	0	0	23	0
Contingent milestone payments	0	0	(5)	(1)
Change in fair value of contingent consideration	4	0	5	(96)
Ending Balance	$ 91	$ 45	$ 91	$ 45	$ 91	$ 68	$ 91	$ 68	$ 66	$ 51	$ 25	$ 17		$ 26		$ 65