Financing Arrangements, 2013 Senior Convertible Notes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended
Jul. 27, 2012	Apr. 27, 2012
Equity and Debt Information
Net carrying amount	$ 7,386	$ 7,359
2013 Senior Convertible Notes
Equity and Debt Information
Carrying amount of the equity component	547	547
Principal amount	2,200	2,200
Unamortized discount	(67)	(90)
Net carrying amount	2,133	2,110
Interest Rate and Interest Expense Amounts
Effective interest rate	6.03%	6.03%
Interest cost related to contractual interest coupon	9	9
Interest cost related to amortization of the discount	$ 23	$ 21

The amount of debt discount (net of debt premium) that was originally recognized at the issuance of the instrument that has yet to be amortized.

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-Name Accounting Standards Codification

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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.

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