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Revenue - Disaggregation of Net Sales by Market Geography for Each Segment (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
U.S. |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 14,919 | 16,194 | 15,875
Non-U.S. Developed Markets |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 9,287 | 9,631 | 9,627
Emerging Markets |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 4,707 | 4,732 | 4,451
Cardiac and Vascular Group |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 10,468 | 11,505 | 11,354
Cardiac and Vascular Group | U.S. |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 5,062 | 5,750 | 5,681
Cardiac and Vascular Group | Non-U.S. Developed Markets |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 3,519 | 3,767 | 3,790
Cardiac and Vascular Group | Emerging Markets |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 1,887 | 1,988 | 1,883
Minimally Invasive Therapies Group |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 8,352 | 8,478 | 8,716
Minimally Invasive Therapies Group | U.S. |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 3,532 | 3,630 | 3,804
Minimally Invasive Therapies Group | Non-U.S. Developed Markets |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 3,169 | 3,250 | 3,378
Minimally Invasive Therapies Group | Emerging Markets |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 1,651 | 1,598 | 1,534
Restorative Therapies Group |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 7,725 | 8,183 | 7,743
Restorative Therapies Group | U.S. |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 5,122 | 5,478 | 5,164
Restorative Therapies Group | Non-U.S. Developed Markets |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 1,659 | 1,759 | 1,720
Restorative Therapies Group | Emerging Markets |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 945 | 946 | 859
Diabetes Group |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 2,368 | 2,391 | 2,140
Diabetes Group | U.S. |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 1,204 | 1,336 | 1,226
Diabetes Group | Non-U.S. Developed Markets |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 940 | 855 | 739
Diabetes Group | Emerging Markets |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | $ 224 | $ 200 | $ 175

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