Derivatives and Currency Exchange Risk Management , Fair Value Hedges (Details) - USD ($)	12 Months Ended
Apr. 29, 2016	Apr. 24, 2015
Senior Notes [Member] \| 4.125 percent ten-year 2011 senior notes [Member]
Derivative [Line Items]
Face value	$ 500,000,000	$ 500,000,000
Stated interest rate	4.125%	4.125%
Senior Notes [Member] \| 3.125 percent ten-year 2012 senior notes [Member]
Derivative [Line Items]
Face value	$ 675,000,000	$ 675,000,000
Stated interest rate	3.125%	3.125%
Senior Notes [Member] \| 4.750 percent ten-year 2005 senior notes [Member]
Derivative [Line Items]
Face value		$ 600,000,000
Stated interest rate		4.75%
Senior Notes [Member] \| 2.625 percent five-year 2011 senior notes [Member]
Derivative [Line Items]
Face value		$ 500,000,000
Stated interest rate		2.625%
Fair Value Hedging [Member] \| Interest rate swaps [Member]
Derivative [Line Items]
Unrealized gain on interest rate fair value hedging instruments	$ 89,000,000	$ 18,000,000
Unrealized loss on interest rate fair value hedged items	89,000,000	18,000,000
Fair Value Hedging [Member] \| Designated as Hedging Instrument [Member] \| Interest rate swaps [Member]
Derivative [Line Items]
Gross notional amount	$ 1,200,000,000	$ 2,000,000,000

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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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+ References

No definition available.

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624171-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5618551-113959

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- Definition

Amount of unrealized gain (loss) related to the fair value of interest rate derivatives 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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5618551-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624171-113959

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