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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
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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)

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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 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 + Details
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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 + Details
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