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Goodwill and Other Intangible Assets (Tables) | 12 Months Ended
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Apr. 28, 2017
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule 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 24, 2015 | $ | 5,855 |  |  | $ | 23,399 |  |  | $ | 9,424 |  |  | $ | 1,852 |  |  | $ | 40,530 |
Goodwill as a result of acquisitions | 393 |  |  | 264 |  |  | 199 |  |  | — |  |  | 856 |
Measurement period adjustments related to Covidien | 21 |  |  | 346 |  |  | 26 |  |  | — |  |  | 393 |
Other adjustments, net | — |  |  | (34 | ) |  | 3 |  |  | — |  |  | (31 | )
Currency adjustment, net | (26 | ) |  | (191 | ) |  | (32 | ) |  | 1 |  |  | (248 | )
April 29, 2016 | 6,243 |  |  | 23,784 |  |  | 9,620 |  |  | $ | 1,853 |  |  | 41,500 |
Goodwill as a result of acquisitions | 457 |  |  | 242 |  |  | 33 |  |  | — |  |  | 732 |
Currency adjustment, net | (49 | ) |  | (705 | ) |  | (53 | ) |  | — |  |  | (807 | )
Goodwill reclassified to noncurrent assets held for sale | — |  |  | (2,910 | ) |  | — |  |  | — |  |  | (2,910 | )
April 28, 2017 | $ | 6,651 |  |  | $ | 20,411 |  |  | $ | 9,600 |  |  | $ | 1,853 |  |  | $ | 38,515 |
Schedule of Finite-Lived Intangible Assets by Major Class | The following table presents the gross carrying amount and accumulated amortization of intangible assets:
| April 28, 2017 |  | April 29, 2016
(in millions) | Gross Carrying Amount |  | Accumulated Amortization |  | Gross Carrying Amount |  | Accumulated Amortization
Definite-lived: |  |  |  |  |  |  |
Customer-related | $ | 16,862 |  |  | $ | (2,166 | ) |  | $ | 18,596 |  |  | $ | (1,331 | )
Purchased technology and patents | 11,461 |  |  | (3,690 | ) |  | 11,397 |  |  | (2,976 | )
Trademarks and tradenames | 772 |  |  | (461 | ) |  | 854 |  |  | (403 | )
Other | 77 |  |  | (42 | ) |  | 72 |  |  | (31 | )
Total | $ | 29,172 |  |  | $ | (6,359 | ) |  | $ | 30,919 |  |  | $ | (4,741 | )
Indefinite-lived: |  |  |  |  |  |  |
IPR&D | $ | 594 |  |  |  |  | $ | 721 |  |  |
Schedule of Indefinite-Lived Intangible Assets by Major Class | The following table presents the gross carrying amount and accumulated amortization of intangible assets:
| April 28, 2017 |  | April 29, 2016
(in millions) | Gross Carrying Amount |  | Accumulated Amortization |  | Gross Carrying Amount |  | Accumulated Amortization
Definite-lived: |  |  |  |  |  |  |
Customer-related | $ | 16,862 |  |  | $ | (2,166 | ) |  | $ | 18,596 |  |  | $ | (1,331 | )
Purchased technology and patents | 11,461 |  |  | (3,690 | ) |  | 11,397 |  |  | (2,976 | )
Trademarks and tradenames | 772 |  |  | (461 | ) |  | 854 |  |  | (403 | )
Other | 77 |  |  | (42 | ) |  | 72 |  |  | (31 | )
Total | $ | 29,172 |  |  | $ | (6,359 | ) |  | $ | 30,919 |  |  | $ | (4,741 | )
Indefinite-lived: |  |  |  |  |  |  |
IPR&D | $ | 594 |  |  |  |  | $ | 721 |  |  |
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense | Estimated aggregate amortization expense by fiscal year based on the current carrying value of definite-lived intangible assets at April 28, 2017, excluding any possible future amortization associated with acquired IPR&D which has not met technological feasibility and amortization associated with definite-lived intangible assets classified as held for sale at April 28, 2017, is as follows:
(in millions) | Amortization Expense
2018 | $ | 1,809 |
2019 | 1,725 |
2020 | 1,680 |
2021 | 1,666 |
2022 | 1,624 |

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