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Goodwill and Other Intangible Assets - Intangible Assets (Details) - USD ($) | 12 Months Ended
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Apr. 24, 2020 | Apr. 26, 2019 | Apr. 27, 2018
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | $ 28,244,000,000 | $ 29,004,000,000 |
Accumulated Amortization | (9,704,000,000) | (9,048,000,000) |
Impairment of finite-lived intangible assets | 37,000,000 | 87,000,000 | $ 0
Impairment of indefinite-lived intangible assets | 35,000,000 | 30,000,000 |
Cardiac and Vascular Group |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Impairment of finite-lived intangible assets | 4,000,000 | 61,000,000 |
Impairment of indefinite-lived intangible assets | 10,000,000 | 9,000,000 |
Restorative Therapies Group |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Impairment of finite-lived intangible assets | 33,000,000 | 26,000,000 |
Impairment of indefinite-lived intangible assets | 25,000,000 | 11,000,000 | $ 68,000,000
Minimally Invasive Therapies Group |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Impairment of indefinite-lived intangible assets |  | 10,000,000 |
IPR&D |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Indefinite-lived Intangible Assets | 523,000,000 | 604,000,000 |
Customer-related |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | 16,963,000,000 | 16,944,000,000 |
Accumulated Amortization | (5,065,000,000) | (4,095,000,000) |
Purchased technology and patents |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | 10,742,000,000 | 11,405,000,000 |
Accumulated Amortization | (4,354,000,000) | (4,570,000,000) |
Trademarks and tradenames |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | 464,000,000 | 570,000,000 |
Accumulated Amortization | (232,000,000) | (324,000,000) |
Other |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | 75,000,000 | 85,000,000 |
Accumulated Amortization | $ (53,000,000) | $ (59,000,000) |

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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/disclosureRef -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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 928 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6473545&loc=d3e61844-108004 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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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