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. 25, 2013	Apr. 26, 2013	Oct. 25, 2013 Level 3	Oct. 26, 2012 Level 3	Oct. 25, 2013 Level 3	Oct. 26, 2012 Level 3	Oct. 25, 2013 Recurring Level 3	Apr. 26, 2013 Recurring Level 3	Oct. 25, 2013 Recurring Level 3 Revenue-based Payments	Oct. 25, 2013 Recurring Level 3 Revenue-based Payments Discounted Cash Flow	Oct. 25, 2013 Recurring Level 3 Product Development-based Payments	Oct. 25, 2013 Recurring Level 3 Product Development-based Payments Discounted Cash Flow	Oct. 25, 2013 Other Long-term Liabilities	Apr. 26, 2013 Other Long-term Liabilities	Oct. 25, 2013 Other Accrued Expenses	Apr. 26, 2013 Other Accrued Expenses	Oct. 25, 2013 Minimum Recurring Level 3 Revenue-based Payments	Oct. 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	$ 199
Fair Value Inputs
Discount rate											5.90%						13.00%	24.00%
Probability of payment									100.00%		100.00%
Projected fiscal year of payment											2017						2014	2019
Reconciliation of Beginning and Ending Balances of Contingent Milestone Payments Associated with Acquisitions
Beginning Balance	45	142	45	215	142	231	45	142		41		4	36	120	9	22
Purchase price contingent consideration			0	0	0	5
Contingent milestone payments			0	0	(1)	(26)
Change in fair value of contingent consideration			0	(2)	(96)	3
Ending Balance	$ 45	$ 142	$ 45	$ 213	$ 45	$ 213	$ 45	$ 142		$ 41		$ 4	$ 36	$ 120	$ 9	$ 22