Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
Oct. 26, 2012	Oct. 28, 2011	Oct. 26, 2012	Oct. 28, 2011	Apr. 27, 2012
Income Tax Disclsosure [Abstract]
Effective tax rate from continuing operations	24.36%	17.16%	22.25%	18.34%
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	$ 4
Gross unrecognized tax benefits	915		915		917
Accrued income tax interest and penalties	74		74
Unrecognized tax benefits that would impact effective tax rate	$ 878		$ 878

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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Reflects the effects of adjustments of previously recorded tax expense, significant settlements of income tax disputes, and unusual tax positions or infrequent actions taken by the entity, including tax assessment reversal, IRS tax settlement and unusual repatriation of foreign earnings.

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- Definition

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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