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Acquisitions - Additional Information (Details) - USD ($) |  | 12 Months Ended | 13 Months Ended
--- | --- | --- | ---
Dec. 18, 2018 | Apr. 24, 2020 | Apr. 26, 2019 | Apr. 27, 2018 | Jan. 24, 2020
Business Acquisition [Line Items] |  |  |  |  |
Goodwill |  | $ 39,841,000,000 | $ 39,959,000,000 | $ 39,543,000,000 |
Purchase price contingent consideration |  | 125,000,000 | 151,000,000 |  |
Purchase accounting adjustments. increase to goodwill |  | 124,000,000 |  |  |
Fair value of contingent consideration |  | 280,000,000 | 222,000,000 | 173,000,000 |
Other accrued expenses |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Fair value of contingent consideration |  | 112,000,000 | 73,000,000 |  |
Other liabilities |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Fair value of contingent consideration |  | 168,000,000 | 149,000,000 |  |
IPR&D |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
In-process research and development acquired in connection with asset acquisition |  | $ 0 | 38,000,000 | $ 0 |
Minimum |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Estimated useful life |  | 3 years |  |  |
Maximum |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Estimated useful life |  | 20 years |  |  |
All Business Acquisitions |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Net assets acquired |  | $ 612,000,000 |  |  |
Assets acquired |  | 679,000,000 |  |  |
Liabilities assumed |  | 67,000,000 |  |  |
Goodwill |  | 333,000,000 |  |  |
Inventory |  | 40,000,000 |  |  |
Purchase price contingent consideration |  | 80,000,000 |  |  |
All Business Acquisitions | Technology-Based Intangible Assets |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Intangible assets acquired |  | $ 236,000,000 |  |  |
All Business Acquisitions | Technology-Based Intangible Assets | Minimum |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Estimated useful life |  | 8 years |  |  |
All Business Acquisitions | Technology-Based Intangible Assets | Maximum |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Estimated useful life |  | 16 years |  |  |
All Business Acquisitions | Customer-Related Intangible Assets |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Intangible assets acquired |  | $ 26,000,000 |  |  |
All Business Acquisitions | Customer-Related Intangible Assets | Minimum |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Estimated useful life |  | 8 years |  |  |
All Business Acquisitions | Customer-Related Intangible Assets | Maximum |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Estimated useful life |  | 16 years |  |  |
Mazor Robotics |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Net assets acquired | $ 1,674,000,000 |  |  |  |
Assets acquired | 1,905,000,000 |  |  |  |
Liabilities assumed | 231,000,000 |  |  |  |
Intangible assets acquired | 399,000,000 |  |  |  |
Goodwill | 1,318,000,000 |  |  |  |
Inventory | 5,000,000 |  |  |  |
Total consideration for the transaction, net of cash acquired, including previously-held equity investment | 1,600,000,000 |  |  |  |
Cash consideration | 1,300,000,000 |  |  |  |
Previously-held equity investment | 246,000,000 |  |  |  |
Costs incurred in connection with acquisition |  |  | 51,000,000 |  |
Purchase accounting adjustments. increase to goodwill |  |  |  |  | $ 105,000,000
Mazor Robotics | Technology-Based Intangible Assets |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Intangible assets acquired | $ 383,000,000 |  |  |  |
Estimated useful life | 10 years |  |  |  |
Mazor Robotics | Tradenames |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Intangible assets acquired | $ 16,000,000 |  |  |  |
Estimated useful life | 10 years |  |  |  |
Series of Individually Immaterial Business Acquisitions |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Net assets acquired |  |  | 698,000,000 |  |
Assets acquired |  |  | 763,000,000 |  |
Liabilities assumed |  |  | 65,000,000 |  |
Goodwill |  |  | 313,000,000 |  |
Purchase price contingent consideration |  |  | 151,000,000 |  |
Series of Individually Immaterial Business Acquisitions | IPR&D |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
In-process research and development acquired in connection with asset acquisition |  |  | 171,000,000 |  |
Series of Individually Immaterial Business Acquisitions | Technology-Based Intangible Assets |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Intangible assets acquired |  |  | $ 161,000,000 |  |
Series of Individually Immaterial Business Acquisitions | Technology-Based Intangible Assets | Minimum |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Estimated useful life |  |  | 4 years |  |
Series of Individually Immaterial Business Acquisitions | Technology-Based Intangible Assets | Maximum |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Estimated useful life |  |  | 15 years |  |
Series of Individually Immaterial Business Acquisitions | Customer-Related Intangible Assets |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Intangible assets acquired |  |  | $ 40,000,000 |  |
Series of Individually Immaterial Business Acquisitions | Customer-Related Intangible Assets | Minimum |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Estimated useful life |  |  | 10 years |  |
Series of Individually Immaterial Business Acquisitions | Customer-Related Intangible Assets | Maximum |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Estimated useful life |  |  | 13 years |  |

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- Definition Fair value at acquisition-date of the assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interests issued by the acquirer, including but not limited to, instruments or interests issued or issuable in consideration for the business combination. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120321790&loc=d3e6927-128479 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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