Derivatives and Foreign Exchange Risk Management, Fair Value Hedges (Details) (USD $)	9 Months Ended
Jan. 23, 2015	Apr. 25, 2014
Senior Notes 2010 Due 2015
Fair Value Hedges
Principal amount	$ 1,250,000,000
Stated interest rate	3.00%
Senior Notes 2005 Due 2016
Fair Value Hedges
Principal amount	600,000,000
Stated interest rate	4.75%
Senior Notes 2011 Due 2016
Fair Value Hedges
Principal amount	500,000,000
Stated interest rate	2.625%
Senior Notes 2011 Due 2021
Fair Value Hedges
Principal amount	500,000,000
Stated interest rate	4.125%
Senior Notes 2012 Due 2022
Fair Value Hedges
Principal amount	675,000,000
Stated interest rate	3.125%
Fair Value Hedging \| Interest Rate Swap
Fair Value Hedges
Interest rate derivatives hedged items	the Company’s $1.250 billion 3.000 percent 2010 Senior Notes and the $600 million 4.750 percent 2005 Senior Notes classified as short-term borrowings, 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	96,000,000
Unrealized loss on interest rate fair value hedged items	(96,000,000)
Designated as Hedging Instrument \| Fair Value Hedging \| Interest Rate Swap
Fair Value Hedges
Derivative, notional amount	$ 2,625,000,000	$ 2,625,000,000

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 12

-Section 13

-Sentence Column B

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Market value related to 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.

+ References

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Market value of outstanding interest rate swap agreements designated as fair value hedging instruments, as offset by the gain (loss) on the hedged item to the extent that the fair value hedge is determined to be effective.

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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Description of the instruments designated as hedged items in hedges involving interest rate derivatives.

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