Certain Litigation Charges, Net (Details) (Litigation with Edwards, USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
Oct. 26, 2012	Oct. 26, 2012
Litigation with Edwards
Loss Contingencies [Line Items]
Loss contingency accrual	$ 245	$ 245

The charge against earnings in the period to increase loss contingency liabilities, net of any adjustments to reduce previously estimated charges.

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 5

-Paragraph 9, 10, 11, 12

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6952336&loc=d3e14326-108349

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration