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Goodwill and Other Intangible Assets , Intangible Assets (Details) - USD ($) | 12 Months Ended
--- | ---
Apr. 28, 2017 | Apr. 29, 2016 | Apr. 24, 2015
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | $ 29,172,000,000 | $ 30,919,000,000 |
Accumulated Amortization | (6,359,000,000) | (4,741,000,000) |
Impairment of finite-lived intangible assets | 0 | 0 | $ 0
Impairment of indefinite-lived intangible assets | 0 | 0 |
IPR&D |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Indefinite-lived Intangible Assets | 594,000,000 | 721,000,000 |
Impairment of indefinite-lived intangible assets |  |  | $ 5,000,000
Customer-related |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | 16,862,000,000 | 18,596,000,000 |
Accumulated Amortization | (2,166,000,000) | (1,331,000,000) |
Purchased technology and patents |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | 11,461,000,000 | 11,397,000,000 |
Accumulated Amortization | (3,690,000,000) | (2,976,000,000) |
Trademarks and tradenames |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | 772,000,000 | 854,000,000 |
Accumulated Amortization | (461,000,000) | (403,000,000) |
Other |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | 77,000,000 | 72,000,000 |
Accumulated Amortization | $ (42,000,000) | $ (31,000,000) |

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of a finite-lived intangible asset to fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16373-109275 + Details
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