Goodwill and Other Intangible Assets, Net (Tables)

6 Months Ended

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 endedOctober 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