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Goodwill and Other Intangible Assets (Tables) | 3 Months Ended
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Jul. 28, 2017
Goodwill and Intangible Assets Disclosure [Abstract] |
Changes in the Carrying Amount of Goodwill | The following table presents the changes in the carrying amount of goodwill by reportable segment:
(in millions) | Cardiac and Vascular Group |  | Minimally Invasive Therapies Group |  | Restorative Therapies Group |  | Diabetes Group |  | Total
April 28, 2017 | $ | 6,651 |  |  | $ | 20,411 |  |  | $ | 9,600 |  |  | $ | 1,853 |  |  | $ | 38,515 |
Purchase accounting adjustments | 54 |  |  | — |  |  | — |  |  | — |  |  | 54 |
Currency adjustment, net | 58 |  |  | 514 |  |  | 56 |  |  | (1 | ) |  | 627 |
July 28, 2017 | $ | 6,763 |  |  | $ | 20,925 |  |  | $ | 9,656 |  |  | $ | 1,852 |  |  | $ | 39,196 |
Gross Carrying Amount of Indefinite-Lived Intangible Assets | The following table presents the gross carrying amount and accumulated amortization of intangible assets:
| July 28, 2017 |  | April 28, 2017
(in millions) | Gross Carrying Amount |  | Accumulated Amortization |  | Gross Carrying Amount |  | Accumulated Amortization
Definite-lived: |  |  |  |  |  |  |
Customer-related | $ | 16,887 |  |  | $ | (2,408 | ) |  | $ | 16,862 |  |  | $ | (2,166 | )
Purchased technology and patents | 11,514 |  |  | (3,883 | ) |  | 11,461 |  |  | (3,690 | )
Trademarks and tradenames | 773 |  |  | (480 | ) |  | 772 |  |  | (461 | )
Other | 79 |  |  | (45 | ) |  | 77 |  |  | (42 | )
Total | $ | 29,253 |  |  | $ | (6,816 | ) |  | $ | 29,172 |  |  | $ | (6,359 | )
Indefinite-lived: |  |  |  |  |  |  |
IPR&D | $ | 569 |  |  |  |  | $ | 594 |  |  |
Gross Carrying Amount and Accumulated Amortization of Definite-Lived Intangible Assets | The following table presents the gross carrying amount and accumulated amortization of intangible assets:
| July 28, 2017 |  | April 28, 2017
(in millions) | Gross Carrying Amount |  | Accumulated Amortization |  | Gross Carrying Amount |  | Accumulated Amortization
Definite-lived: |  |  |  |  |  |  |
Customer-related | $ | 16,887 |  |  | $ | (2,408 | ) |  | $ | 16,862 |  |  | $ | (2,166 | )
Purchased technology and patents | 11,514 |  |  | (3,883 | ) |  | 11,461 |  |  | (3,690 | )
Trademarks and tradenames | 773 |  |  | (480 | ) |  | 772 |  |  | (461 | )
Other | 79 |  |  | (45 | ) |  | 77 |  |  | (42 | )
Total | $ | 29,253 |  |  | $ | (6,816 | ) |  | $ | 29,172 |  |  | $ | (6,359 | )
Indefinite-lived: |  |  |  |  |  |  |
IPR&D | $ | 569 |  |  |  |  | $ | 594 |  |  |
Estimated Future Aggregate Amortization Expense, Definite-Lived Intangible Assets | Estimated aggregate amortization expense by fiscal year based on the current carrying value of definite-lived intangible assets at July 28, 2017, excluding any possible future amortization associated with acquired IPR&D which has not yet met technological feasibility and amortization associated with definite-lived intangible assets classified as held for sale at July 28, 2017, is as follows:
(in millions) | Amortization Expense
Remaining 2018 | $ | 1,365 |
2019 | 1,741 |
2020 | 1,693 |
2021 | 1,674 |
2022 | 1,631 |
2023 | 1,564 |

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