Derivatives and Foreign Exchange Risk Management - Gains (Losses) on Derivatives and Amounts Reclassified into Income (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Jan. 29, 2016	Jan. 23, 2015	Jan. 29, 2016	Jan. 23, 2015
Other expense, net [Member] \| Foreign currency exchange rate contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Foreign currency exchange rate contracts gains (losses)	$ 19	$ 153	$ 35	$ 202
Cash flow hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gross Gains (Losses) Recognized in OCI on Effective Portion of Derivative	104	265	108	556
Effective Portion of Gains (Losses) on Derivative Reclassified from AOCI into Income	102	38	250	58
Cash flow hedging [Member] \| Foreign currency exchange rate contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gross Gains (Losses) Recognized in OCI on Effective Portion of Derivative	104	265	108	556
Cash flow hedging [Member] \| Other expense, net [Member] \| Foreign currency exchange rate contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Effective Portion of Gains (Losses) on Derivative Reclassified from AOCI into Income	111	65	295	86
Cash flow hedging [Member] \| Cost of products sold [Member] \| Foreign currency exchange rate contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Effective Portion of Gains (Losses) on Derivative Reclassified from AOCI into Income	$ (9)	$ (27)	$ (45)	$ (28)

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The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

+ 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 (c)
-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 4D
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624177-113959

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- Definition

The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period.

+ References

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Amount of gain (loss) recognized in earnings in the period from the increase (decrease) in fair value of foreign currency derivatives not designated as hedging instruments.

+ 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 (e)
-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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