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Goodwill and Other Intangible Assets - Changes in Goodwill (Details) - USD ($) | 12 Months Ended
--- | ---
Apr. 24, 2020 | Apr. 26, 2019 | Apr. 27, 2018
Goodwill [Roll Forward] |  |  |
Goodwill, beginning balance | $ 39,959,000,000 | $ 39,543,000,000 |
Goodwill as a result of acquisitions | 333,000,000 | 1,510,000,000 |
Purchase accounting adjustments | 124,000,000 |  |
Currency translation and other | (575,000,000) | (1,094,000,000) |
Goodwill, ending balance | 39,841,000,000 | 39,959,000,000 | $ 39,543,000,000
Goodwill impairment | 0 | 0 | 0
Cardiac and Vascular Group |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, beginning balance | 6,854,000,000 | 6,791,000,000 |
Goodwill as a result of acquisitions | 19,000,000 | 165,000,000 |
Purchase accounting adjustments | 7,000,000 |  |
Currency translation and other | (49,000,000) | (102,000,000) |
Goodwill, ending balance | 6,831,000,000 | 6,854,000,000 | 6,791,000,000
Minimally Invasive Therapies Group |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, beginning balance | 20,381,000,000 | 21,155,000,000 |
Goodwill as a result of acquisitions | 227,000,000 | 83,000,000 |
Purchase accounting adjustments | 2,000,000 |  |
Currency translation and other | (434,000,000) | (857,000,000) |
Goodwill, ending balance | 20,176,000,000 | 20,381,000,000 | 21,155,000,000
Restorative Therapies Group |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, beginning balance | 10,821,000,000 | 9,717,000,000 |
Goodwill as a result of acquisitions | 71,000,000 | 1,238,000,000 |
Purchase accounting adjustments | 120,000,000 |  |
Currency translation and other | (92,000,000) | (134,000,000) |
Goodwill, ending balance | 10,920,000,000 | 10,821,000,000 | 9,717,000,000
Diabetes Group |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, beginning balance | 1,903,000,000 | 1,880,000,000 |
Goodwill as a result of acquisitions | 16,000,000 | 24,000,000 |
Purchase accounting adjustments | (5,000,000) |  |
Currency translation and other | 0 | (1,000,000) |
Goodwill, ending balance | $ 1,914,000,000 | $ 1,903,000,000 | $ 1,880,000,000

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