Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
Oct. 28, 2011	Oct. 29, 2010	Oct. 28, 2011	Oct. 29, 2010	Apr. 29, 2011
Income Tax Disclsosure [Abstract]
Tax adjustments	$ 17
Unrecognized tax benefits that would impact effective tax rate	709		709
Accrued income tax penalties and interest	103		103
Components of earning before income taxes
Earnings before income taxes	1,053	752	2,075	1,792
Provision for income taxes	182	186	383	396
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Gross unrecognized tax benefits	786		786		769
Gross unrecognized tax benefits at end of fiscal year	$ 786		$ 786		$ 769

The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to 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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