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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		9 Months Ended					3 Months Ended
	Jan. 25, 2013	Jan. 27, 2012	Jan. 25, 2013	Jan. 27, 2012	Apr. 27, 2012	Jan. 25, 2013 Italy, Spain, Portugal and Greece	Apr. 27, 2012 Italy, Spain, Portugal and Greece	Jul. 27, 2012 Spain
General Discussion of Derivatives
Notional amount of currency exchange rate derivative instruments	$ 6,610		$ 6,610		$ 5,136
Currency exchange rate gains/(losses)	17	(35)	11	(168)
Statement [Line Items]
Accounts receivable net of allowance						753	967
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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