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Goodwill and Other Intangible Assets, Net (Tables) | 6 Months Ended
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Oct. 30, 2015
Goodwill and Intangible Assets Disclosure [Abstract] |
Changes in the Carrying Amount of Goodwill | The changes in the carrying amount of goodwill for the six months ended October 30, 2015 are as follows:
(in millions) | Cardiac and Vascular Group |  | Minimally Invasive Therapies Group |  | Restorative Therapies Group |  | Diabetes Group |  | Total
Balance as of April 24, 2015 | $ | 5,855 |  |  | $ | 23,399 |  |  | $ | 9,424 |  |  | $ | 1,852 |  |  | $ | 40,530 |
Goodwill as a result of acquisitions | 409 |  |  | 132 |  |  | 191 |  |  | — |  |  | 732 |
Purchase accounting adjustments, net | 24 |  |  | (9 | ) |  | 5 |  |  | — |  |  | 20 |
Currency adjustment, net | (6 | ) |  | — |  |  | (3 | ) |  | 1 |  |  | (8 | )
Balance as of October 30, 2015 | $ | 6,282 |  |  | $ | 23,522 |  |  | $ | 9,617 |  |  | $ | 1,853 |  |  | $ | 41,274 |
Gross Carrying Amount of Non-Amortizable Intangible Assets | The gross carrying amount and accumulated amortization of intangible assets at October 30, 2015 and April 24, 2015 are as follows:
| October 30, 2015 |  | April 24, 2015
(in millions) | Gross Carrying Amount |  | Accumulated Amortization |  | Gross Carrying Amount |  | Accumulated Amortization
Amortizable: |  |  |  |  |  |  |
Customer-related | $ | 18,579 |  |  | $ | (801 | ) |  | $ | 18,492 |  |  | $ | (273 | )
Purchased technology and patents | 11,265 |  |  | (2,560 | ) |  | 11,118 |  |  | (2,268 | )
Trademarks and tradenames | 850 |  |  | (408 | ) |  | 640 |  |  | (363 | )
Other | 84 |  |  | (47 | ) |  | 79 |  |  | (44 | )
Total | $ | 30,778 |  |  | $ | (3,816 | ) |  | $ | 30,329 |  |  | $ | (2,948 | )
Non-Amortizable: |  |  |  |  |  |  |
IPR&D | $ | 769 |  |  |  |  | $ | 470 |  |  |
Tradenames | — |  |  |  |  | 250 |  |  |
Total | $ | 769 |  |  |  |  | $ | 720 |  |  |
Gross Carrying Amount and Accumulated Amortization of Amortizable Intangible Assets | The gross carrying amount and accumulated amortization of intangible assets at October 30, 2015 and April 24, 2015 are as follows:
| October 30, 2015 |  | April 24, 2015
(in millions) | Gross Carrying Amount |  | Accumulated Amortization |  | Gross Carrying Amount |  | Accumulated Amortization
Amortizable: |  |  |  |  |  |  |
Customer-related | $ | 18,579 |  |  | $ | (801 | ) |  | $ | 18,492 |  |  | $ | (273 | )
Purchased technology and patents | 11,265 |  |  | (2,560 | ) |  | 11,118 |  |  | (2,268 | )
Trademarks and tradenames | 850 |  |  | (408 | ) |  | 640 |  |  | (363 | )
Other | 84 |  |  | (47 | ) |  | 79 |  |  | (44 | )
Total | $ | 30,778 |  |  | $ | (3,816 | ) |  | $ | 30,329 |  |  | $ | (2,948 | )
Non-Amortizable: |  |  |  |  |  |  |
IPR&D | $ | 769 |  |  |  |  | $ | 470 |  |  |
Tradenames | — |  |  |  |  | 250 |  |  |
Total | $ | 769 |  |  |  |  | $ | 720 |  |  |
Estimated Future Aggregate Amortization Expense, Amortizable Intangible Assets | Estimated aggregate amortization expense based on the current carrying value of amortizable intangible assets as of October 30, 2015, excluding any possible future amortization associated with acquired IPR&D, which has not met technological feasibility, is as follows:
(in millions) Fiscal Year | Estimated Amortization Expense
Remaining 2016 | $ | 964 |
2017 | 1,913 |
2018 | 1,882 |
2019 | 1,789 |
2020 | 1,741 |
2021 | 1,724 |

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