Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended
Jan. 25, 2013	Jan. 27, 2012	Jan. 25, 2013	Jan. 27, 2012	Apr. 27, 2012
Income Tax Disclosure [Abstract]
Effective tax rate from continuing operations	14.46%	19.75%	19.34%	18.85%
Net benefit associated with foreign dividend distributions, resolution of certain income tax audits, finalization of certain income tax returns, and changes to uncertain tax position reserves	$ 29
Gross unrecognized tax benefits	924		924		917
Accrued income tax interest and penalties	82		82
Unrecognized tax benefits that would impact effective tax rate	$ 888		$ 888

A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations.

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This element represents the total of accruals as of the date of the statement of financial position for interest recognized for an underpayment of income taxes computed by applying the applicable statutory rate of interest to the difference between a tax position recognized for financial reporting purposes and the amount previously taken or expected to be taken in a tax return of the entity and the amount of statutory penalties for a tax position claimed or expected to be claimed by the entity, in its tax return, that does not meet the minimum statutory threshold to avoid payment of penalties.

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