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Financial Instruments - Available-For-Sale Securities in Continuous Unrealized Loss Position (Details) - USD ($) $ in Millions	Jul. 28, 2017	Apr. 28, 2017
AFS Continuous Unrealized Loss Position
Less than 12 months, Fair Value	$ 2,392	$ 2,749
Less than 12 months, Unrealized Losses	(32)	(43)
More than 12 months, Fair Value	1,311	1,312
More than 12 months, Unrealized Losses	(185)	(203)
Corporate debt securities
AFS Continuous Unrealized Loss Position
Less than 12 months, Fair Value	927	1,263
Less than 12 months, Unrealized Losses	(13)	(19)
More than 12 months, Fair Value	47	46
More than 12 months, Unrealized Losses	(5)	(4)
Auction rate securities
AFS Continuous Unrealized Loss Position
Less than 12 months, Fair Value	0	0
Less than 12 months, Unrealized Losses	0	0
More than 12 months, Fair Value	44	44
More than 12 months, Unrealized Losses	(3)	(3)
Mortgage-backed securities
AFS Continuous Unrealized Loss Position
Less than 12 months, Fair Value	270	276
Less than 12 months, Unrealized Losses	(3)	(4)
More than 12 months, Fair Value	92	95
More than 12 months, Unrealized Losses	(13)	(12)
U.S. government and agency securities
AFS Continuous Unrealized Loss Position
Less than 12 months, Fair Value	898	896
Less than 12 months, Unrealized Losses	(13)	(15)
More than 12 months, Fair Value	0	0
More than 12 months, Unrealized Losses	0	0
Debt funds
AFS Continuous Unrealized Loss Position
Less than 12 months, Fair Value	188	173
Less than 12 months, Unrealized Losses	(1)	(1)
More than 12 months, Fair Value	1,126	1,125
More than 12 months, Unrealized Losses	(163)	(183)
Other asset-backed securities
AFS Continuous Unrealized Loss Position
Less than 12 months, Fair Value	108	127
Less than 12 months, Unrealized Losses	(1)	(1)
More than 12 months, Fair Value	0	0
More than 12 months, Unrealized Losses	0	0
Marketable equity securities
AFS Continuous Unrealized Loss Position
Less than 12 months, Fair Value	1	14
Less than 12 months, Unrealized Losses	(1)	(3)
More than 12 months, Fair Value	2	2
More than 12 months, Unrealized Losses	$ (1)	$ (1)

X

- Definition

Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563

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- References

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- Definition

Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for less than twelve months.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563

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- Definition

This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for less than twelve months.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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-Section 50
-Paragraph 6
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563

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- Definition

This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for twelve months or longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563

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