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Segment and Geographic Information - Schedule of Net Sales to External Customers and Property, Plant, and Equipment, Net, by Geographic Region (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
Revenues from External Customers and Long-Lived Assets [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
Property, plant, and equipment, net | 4,828 |  |  |  | 4,675 |  |  |  | 4,828 | 4,675 |
Ireland |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 85 | 91 | 85
Property, plant, and equipment, net | 164 |  |  |  | 156 |  |  |  | 164 | 156 |
United States |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 14,919 | 16,194 | 15,875
Property, plant, and equipment, net | 3,459 |  |  |  | 3,122 |  |  |  | 3,459 | 3,122 |
Rest of world |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 13,909 | 14,272 | 13,993
Property, plant, and equipment, net | 1,205 |  |  |  | 1,397 |  |  |  | 1,205 | 1,397 |
Total other countries, excluding Ireland |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 28,828 | 30,466 | $ 29,868
Property, plant, and equipment, net | $ 4,664 |  |  |  | $ 4,519 |  |  |  | $ 4,664 | $ 4,519 |

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