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Derivatives and Foreign Exchange Risk Management, Credit Risk and Other Disclosures (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Jul. 27, 2012	Jul. 29, 2011	Apr. 27, 2012
General Discussion of Derivatives
Notional amount of currency exchange rate derivative instruments	$ 5,355		$ 5,136
Net currency exchange rate gains/(losses)	19	(56)
Italy, Spain, Portugal and Greece
Statement [Line Items]
Accounts receivable net of allowance	701		967
Spain
Statement [Line Items]
Proceeds from customers	$ 212

Aggregate impact of foreign currency derivatives on earnings for the period. Includes impact of foreign currency cash flow hedge ineffectiveness and the ineffectiveness of fair value hedging derivatives and full change in fair value of the foreign currency derivatives not designated as hedging instruments.

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