Goodwill and Other Intangible Assets, Net (Tables)

6 Months Ended

Oct. 24, 2014

Goodwill and Intangible Assets Disclosure [Abstract]

The changes in the carrying amount of goodwill for the six months ended October 24, 2014 are as follows:



(in millions)	Cardiac and Vascular Group			Restorative Therapies Group			Diabetes Group		Total
Balance as of April 25, 2014	$	2,881		$	6,368		$	1,344	$	10,593
Goodwill as a result of acquisitions	234			219			—		453
Other adjustments, net	1			—			—		1
Currency adjustment, net	(14		)	(9		)	—		(23		)
Balance as of October 24, 2014	$	3,102		$	6,578		$	1,344	$	11,024

Schedule of Intangible Assets by Major Class

Balances of other intangible assets, net, excluding goodwill as of October 24, 2014 and April 25, 2014 are as follows:



(in millions)	Purchased Technology and Patents			Trademarks and Tradenames			Acquired IPR&D		Other			Total
Other intangible assets as of October 24, 2014:
Original cost	$	3,978		$	428		$	138	$	308		$	4,852
Accumulated amortization	(2,019		)	(340		)	—		(56		)	(2,415		)
Carrying value	$	1,959		$	88		$	138	$	252		$	2,437
Other intangible assets as of April 25, 2014:
Original cost	$	3,857		$	408		$	119	$	200		$	4,584
Accumulated amortization	(1,878		)	(332		)	—		(88		)	(2,298		)
Carrying value	$	1,979		$	76		$	119	$	112		$	2,286

Schedule of Finite-Lived Intangible Assets, Future Amortization Expense

Estimated aggregate amortization expense based on the current carrying value of amortizable intangible assets, 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 2015	$	191
2016	347
2017	325
2018	310
2019	265
2020	217
Thereafter	644
Total estimated amortization expense	$	2,299