Derivatives and Foreign Exchange Risk Management, Fair Value Hedges (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
Oct. 25, 2013	Oct. 25, 2013
Senior Notes 2010 Due 2015
Fair Value Hedges
Principal amount	$ 1,250	$ 1,250
Stated interest rate	3.00%	3.00%
Senior Notes 2005 Due 2016
Fair Value Hedges
Principal amount	600	600
Stated interest rate	4.75%	4.75%
Senior Notes 2011 Due 2016
Fair Value Hedges
Principal amount	500	500
Stated interest rate	2.625%	2.625%
Senior Notes 2011 Due 2021
Fair Value Hedges
Principal amount	500	500
Stated interest rate	4.125%	4.125%
Senior Notes 2012 Due 2022
Fair Value Hedges
Principal amount	675	675
Stated interest rate	3.125%	3.125%
Fair Value Hedges [Member] \| Interest Rate Swap
Fair Value Hedges
Notional amount of interest rate fair value hedges	2,625	2,625
Interest rate derivatives hedged items		the Company’s $1.250 billion 3.000 percent 2010 Senior Notes, the $600 million 4.750 percent 2005 Senior Notes, the $500 million 2.625 percent 2011 Senior Notes, the $500 million 4.125 percent 2011 Senior Notes, and the $675 million 3.125 percent 2012 Senior Notes
Unrealized gain on interest rate fair value hedging instruments	99
Unrealized loss on interest rate fair value hedged items	$ 99

The stated principal amount of the debt instrument at time of issuance, which may vary from the carrying amount because of unamortized premium or discount.

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Amount of unrealized gain (loss) included in earnings related to the fair value of the hedged item in an interest rate fair value hedge, offset by the gain (loss) on the hedging instrument to the extent that the fair value hedge is determined to be effective.

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