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Financial Instruments - AFS in Continuous Loss Position (Details) - USD ($) $ in Millions | Apr. 24, 2020 | Apr. 26, 2019
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Fair Value |  |
Less than 12 months | $ 1,453 | $ 1,075
More than 12 months | 4,019 | 2,181
Unrealized Losses |  |
Less than 12 months | (6) | (9)
More than 12 months | (135) | (52)
U.S. government and agency securities |  |
Fair Value |  |
Less than 12 months |  | 130
More than 12 months |  | 649
Unrealized Losses |  |
Less than 12 months |  | (1)
More than 12 months |  | (13)
Corporate debt securities |  |
Fair Value |  |
Less than 12 months | 1,368 | 582
More than 12 months | 2,893 | 1,153
Unrealized Losses |  |
Less than 12 months | (2) | (5)
More than 12 months | (88) | (16)
Mortgage-backed securities |  |
Fair Value |  |
Less than 12 months | 35 | 73
More than 12 months | 663 | 250
Unrealized Losses |  |
Less than 12 months | (1) | (1)
More than 12 months | (27) | (19)
Other asset-backed securities |  |
Fair Value |  |
Less than 12 months | 17 | 290
More than 12 months | 463 | 85
Unrealized Losses |  |
Less than 12 months | 0 | (2)
More than 12 months | (20) | (1)
Auction rate securities |  |
Fair Value |  |
Less than 12 months | 33 | 0
More than 12 months | 0 | 44
Unrealized Losses |  |
Less than 12 months | (3) | 0
More than 12 months | $ 0 | $ (3)

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121582814&loc=SL82922890-210455 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27337-111563 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=121590138&loc=SL82922954-210456 + Details
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- Definition Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121582814&loc=SL82922890-210455 + Details
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