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Goodwill and Other Intangible Assets (Tables)
 12 Months Ended
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