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Revenue - Disaggregation of Net Sales by Segment and Division (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Apr. 24, 2020 | Jan. 24, 2020 | Oct. 25, 2019 | Jul. 26, 2019 | Apr. 26, 2019 | Jan. 25, 2019 | Oct. 26, 2018 | Jul. 27, 2018 | Apr. 24, 2020 | Apr. 26, 2019 | Apr. 27, 2018
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 5,998 | $ 7,717 | $ 7,706 | $ 7,493 | $ 8,146 | $ 7,546 | $ 7,481 | $ 7,384 | $ 28,913 | $ 30,557 | $ 29,953
Cardiac and Vascular Group |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 10,468 | 11,505 | 11,354
Cardiac and Vascular Group | Cardiac Rhythm & Heart Failure |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 5,141 | 5,849 | 5,947
Cardiac and Vascular Group | Coronary & Structural Heart |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 3,541 | 3,730 | 3,562
Cardiac and Vascular Group | Aortic, Peripheral & Venous |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 1,786 | 1,926 | 1,845
Minimally Invasive Therapies Group |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 8,352 | 8,478 | 8,716
Minimally Invasive Therapies Group | Surgical Innovations |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 5,513 | 5,753 | 5,537
Minimally Invasive Therapies Group | Respiratory, Gastrointestinal, & Renal |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 2,839 | 2,725 | 3,179
Restorative Therapies Group |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 7,725 | 8,183 | 7,743
Restorative Therapies Group | Brain Therapies |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 2,922 | 2,938 | 2,354
Restorative Therapies Group | Spine |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 2,503 | 2,654 | 2,668
Restorative Therapies Group | Specialty Therapies |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 1,193 | 1,307 | 1,556
Restorative Therapies Group | Pain Therapies |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 1,107 | 1,284 | 1,165
Diabetes Group |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | $ 2,368 | $ 2,391 | $ 2,140

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