Acquisitions and Acquisition-Related Items Acquisition and Acquisition-Related Items, Contingent Consideration (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Apr. 25, 2014	Apr. 26, 2013
Fair Value Inputs
Contingent consideration	$ 68	$ 142
Reconciliation of Beginning and Ending Balances of Contingent Milestone Payments Associated with Acquisitions
Beginning Balance	142	231
Purchase price contingent consideration	65	3
Contingent milestone payments	(1)	(30)
Change in fair value of contingent consideration	(138)	(62)
Ending Balance	68	142
Recurring
Fair Value Inputs
Contingent consideration	68	142
Reconciliation of Beginning and Ending Balances of Contingent Milestone Payments Associated with Acquisitions
Ending Balance	68	142
Recurring \| Level 3
Fair Value Inputs
Contingent consideration	68	142
Reconciliation of Beginning and Ending Balances of Contingent Milestone Payments Associated with Acquisitions
Ending Balance	68	142
Recurring \| Level 3 \| Revenue-based payments
Fair Value Inputs
Contingent consideration	43
Reconciliation of Beginning and Ending Balances of Contingent Milestone Payments Associated with Acquisitions
Ending Balance	43
Recurring \| Level 3 \| Revenue-based payments \| Discounted Cash Flow
Fair Value Inputs
Probability of payment	100.00%
Recurring \| Level 3 \| Revenue-based payments \| Discounted Cash Flow \| Minimum
Fair Value Inputs
Discount rate	13.50%
Projected fiscal year of payment	2015
Recurring \| Level 3 \| Revenue-based payments \| Discounted Cash Flow \| Maximum
Fair Value Inputs
Discount rate	24.00%
Projected fiscal year of payment	2019
Recurring \| Level 3 \| Product development-based payments
Fair Value Inputs
Contingent consideration	25
Reconciliation of Beginning and Ending Balances of Contingent Milestone Payments Associated with Acquisitions
Ending Balance	$ 25
Recurring \| Level 3 \| Product development-based payments \| Discounted Cash Flow
Fair Value Inputs
Discount rate	5.50%
Recurring \| Level 3 \| Product development-based payments \| Discounted Cash Flow \| Minimum
Fair Value Inputs
Probability of payment	75.00%
Projected fiscal year of payment	2015
Recurring \| Level 3 \| Product development-based payments \| Discounted Cash Flow \| Maximum
Fair Value Inputs
Probability of payment	100.00%
Projected fiscal year of payment	2018

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Contingent milestone payments in business acquisition transactions.

+ References

No definition available.

+ Details

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- Definition

Amount of contingent consideration arrangement resulting from business combinations.

+ References

No definition available.

+ Details

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- Definition

Percentage of likelihood a loan will be repaid, used as an input to measure fair value.

+ References

No definition available.

+ Details

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- Definition

The year in which a loan is expected to be paid, used as an input to measure fair value.

+ References

No definition available.

+ Details

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- Definition

Amount of increase (decrease) in the value of a contingent consideration liability, including, but not limited to, differences arising upon settlement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 30

-Section 50

-Paragraph 4

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=7488404&loc=d3e7008-128479

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- Definition

Amount of liability recognized arising from contingent consideration in a business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 30

-Section 35

-Paragraph 1

-Subparagraph b

-URI http://asc.fasb.org/extlink&oid=6911338&loc=d3e6819-128478

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 30

-Section 25

-Paragraph 6

-URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6408-128476

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- Definition

Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (bbb)

-URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258

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