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Goodwill and Other Intangible Assets (Tables)
 3 Months Ended
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