Goodwill and Other Intangible Assets - Carrying Amount and Accumulated Amortization of Intangible Assets (Details) - USD ($) $ in Millions	Jul. 28, 2017	Apr. 28, 2017
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, Amortizable	$ 29,253	$ 29,172
Accumulated Amortization	(6,816)	(6,359)
IPR&D
Indefinite-lived Intangible Assets [Line Items]
Gross Carrying Amount, Non-Amortizable	569	594
Customer-related
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, Amortizable	16,887	16,862
Accumulated Amortization	(2,408)	(2,166)
Purchased technology and patents
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, Amortizable	11,514	11,461
Accumulated Amortization	(3,883)	(3,690)
Trademarks and tradenames
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, Amortizable	773	772
Accumulated Amortization	(480)	(461)
Other
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, Amortizable	79	77
Accumulated Amortization	$ (45)	$ (42)