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Derivatives and Currency Exchange Risk Management - Classification and Fair Value Amounts of Derivative Instruments in Balance Sheets (Details) - USD ($) $ in Millions	Jul. 28, 2017	Apr. 28, 2017
Derivatives, Fair Value [Line Items]
Asset Derivatives, Fair Value	$ 159	$ 262
Liability Derivatives, Fair Value	278	104
Currency exchange rate contracts
Derivatives, Fair Value [Line Items]
Asset Derivatives, Fair Value	107	216
Liability Derivatives, Fair Value	268	93
Interest rate contracts
Derivatives, Fair Value [Line Items]
Asset Derivatives, Fair Value	41	41
Total return swap
Derivatives, Fair Value [Line Items]
Asset Derivatives, Fair Value	6
Cross currency interest rate contracts
Derivatives, Fair Value [Line Items]
Asset Derivatives, Fair Value	5	5
Liability Derivatives, Fair Value	10	11
Derivatives designated as hedging instruments
Derivatives, Fair Value [Line Items]
Asset Derivatives, Fair Value	126	241
Liability Derivatives, Fair Value	200	57
Derivatives designated as hedging instruments | Currency exchange rate contracts | Prepaid expenses and other current assets
Derivatives, Fair Value [Line Items]
Asset Derivatives, Fair Value	60	152
Derivatives designated as hedging instruments | Currency exchange rate contracts | Other assets
Derivatives, Fair Value [Line Items]
Asset Derivatives, Fair Value	25	48
Derivatives designated as hedging instruments | Currency exchange rate contracts | Other accrued expenses
Derivatives, Fair Value [Line Items]
Liability Derivatives, Fair Value	124	43
Derivatives designated as hedging instruments | Currency exchange rate contracts | Other liabilities
Derivatives, Fair Value [Line Items]
Liability Derivatives, Fair Value	76	14
Derivatives designated as hedging instruments | Interest rate contracts | Other assets
Derivatives, Fair Value [Line Items]
Asset Derivatives, Fair Value	41	41
Derivatives designated as hedging instruments | Interest rate contracts | Other liabilities
Derivatives, Fair Value [Line Items]
Liability Derivatives, Fair Value	0	0
Derivatives not designated as hedging instruments
Derivatives, Fair Value [Line Items]
Asset Derivatives, Fair Value	33	21
Liability Derivatives, Fair Value	78	47
Derivatives not designated as hedging instruments | Currency exchange rate contracts | Prepaid expenses and other current assets
Derivatives, Fair Value [Line Items]
Asset Derivatives, Fair Value	22	16
Derivatives not designated as hedging instruments | Currency exchange rate contracts | Other accrued expenses
Derivatives, Fair Value [Line Items]
Liability Derivatives, Fair Value	68	36
Derivatives not designated as hedging instruments | Total return swap | Prepaid expenses and other current assets
Derivatives, Fair Value [Line Items]
Asset Derivatives, Fair Value	6
Derivatives not designated as hedging instruments | Total return swap | Other accrued expenses
Derivatives, Fair Value [Line Items]
Liability Derivatives, Fair Value	0
Derivatives not designated as hedging instruments | Cross currency interest rate contracts | Other assets
Derivatives, Fair Value [Line Items]
Asset Derivatives, Fair Value	5	5
Derivatives not designated as hedging instruments | Cross currency interest rate contracts | Other liabilities
Derivatives, Fair Value [Line Items]
Liability Derivatives, Fair Value	$ 10	$ 11

X

- Definition

Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
-Subparagraph (a),(c)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624163-113959

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=82849420&loc=SL20226000-175313

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 20
-Section 50
-Paragraph 4D
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=82924980&loc=SL51823488-111719

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X

- Definition

Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 20
-Section 50
-Paragraph 4D
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=82924980&loc=SL51823488-111719

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
-Subparagraph (a),(c)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624163-113959

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=82849420&loc=SL20226000-175313

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+ References

No definition available.

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