Goodwill and Other Intangible Assets, Net - Carrying Amount and Accumulated Amortization of Intangible Assets (Details) - USD ($) $ in Millions	Jan. 29, 2016	Apr. 24, 2015
Indefinite-lived Intangible Assets [Line Items]
Gross Carrying Amount, Non-Amortizable	$ 775	$ 720
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, Amortizable	30,786	30,329
Accumulated Amortization	(4,245)	(2,948)
IPR&D [Member]
Indefinite-lived Intangible Assets [Line Items]
Gross Carrying Amount, Non-Amortizable	775	470
Tradenames [Member]
Indefinite-lived Intangible Assets [Line Items]
Gross Carrying Amount, Non-Amortizable	0	250
Customer-related [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, Amortizable	18,558	18,492
Accumulated Amortization	(1,066)	(273)
Purchased technology and patents [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, Amortizable	11,305	11,118
Accumulated Amortization	(2,722)	(2,268)
Trademarks and tradenames [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, Amortizable	852	640
Accumulated Amortization	(429)	(363)
Other [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, Amortizable	71	79
Accumulated Amortization	$ (28)	$ (44)