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Goodwill and Other Intangible Assets, Net (Tables)
 9 Months Ended
Jan. 29, 2016
Goodwill and Intangible Assets Disclosure [Abstract]  
Changes in the Carrying Amount of Goodwill
The changes in the carrying amount of goodwill for the nine months ended January 29, 2016 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

 
196

 
197

 
—

 
802

Purchase accounting adjustments, net
13

 
346

 
34

 
—

 
393

Currency adjustment, net
(95
)
 
(1,120
)
 
(135
)
 
1

 
(1,349
)
Balance as of January 29, 2016
$
6,182

 
$
22,821

 
$
9,520

 
$
1,853

 
$
40,376
Gross Carrying Amount of Non-Amortizable Intangible Assets
The gross carrying amount and accumulated amortization of intangible assets at January 29, 2016 and April 24, 2015 are as follows:
 
January 29, 2016
 
April 24, 2015
(in millions)
Gross Carrying Amount
 
Accumulated Amortization
 
Gross Carrying Amount
 
Accumulated Amortization
Amortizable:
 
 
 
 
 
 
 
Customer-related
$
18,558

 
$
(1,066
)
 
$
18,492

 
$
(273
)
Purchased technology and patents
11,305

 
(2,722
)
 
11,118

 
(2,268
)
Trademarks and tradenames
852

 
(429
)
 
640

 
(363
)
Other
71

 
(28
)
 
79

 
(44
)
Total
$
30,786

 
$
(4,245
)
 
$
30,329

 
$
(2,948
)
Non-Amortizable:
 
 
 
 
 
 
 
IPR&D
$
775

 
 
 
$
470

 
 
Tradenames
—

 
 
 
250

 
 
Total
$
775

 
 
 
$
720

 
 
Gross Carrying Amount and Accumulated Amortization of Amortizable Intangible Assets
The gross carrying amount and accumulated amortization of intangible assets at January 29, 2016 and April 24, 2015 are as follows:
 
January 29, 2016
 
April 24, 2015
(in millions)
Gross Carrying Amount
 
Accumulated Amortization
 
Gross Carrying Amount
 
Accumulated Amortization
Amortizable:
 
 
 
 
 
 
 
Customer-related
$
18,558

 
$
(1,066
)
 
$
18,492

 
$
(273
)
Purchased technology and patents
11,305

 
(2,722
)
 
11,118

 
(2,268
)
Trademarks and tradenames
852

 
(429
)
 
640

 
(363
)
Other
71

 
(28
)
 
79

 
(44
)
Total
$
30,786

 
$
(4,245
)
 
$
30,329

 
$
(2,948
)
Non-Amortizable:
 
 
 
 
 
 
 
IPR&D
$
775

 
 
 
$
470

 
 
Tradenames
—

 
 
 
250

 
 
Total
$
775

 
 
 
$
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 January 29, 2016, 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
$
484

2017
1,925

2018
1,893

2019
1,799

2020
1,751

2021
1,734