Goodwill and Other Intangible Assets - Carrying Amount and Accumulated Amortization of Intangible Assets (Details) - USD ($) $ in Millions	Jul. 26, 2019	Apr. 26, 2019
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, Definite-lived	$ 28,298	$ 29,004
Accumulated Amortization	(8,667)	(9,048)
IPR&D
Indefinite-lived Intangible Assets [Line Items]
Gross Carrying Amount, Indefinite-lived	603	604
Customer-related
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, Definite-lived	16,968	16,944
Accumulated Amortization	(4,337)	(4,095)
Purchased technology and patents
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, Definite-lived	10,792	11,405
Accumulated Amortization	(4,059)	(4,570)
Trademarks and tradenames
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, Definite-lived	464	570
Accumulated Amortization	(220)	(324)
Other
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, Definite-lived	74	85
Accumulated Amortization	$ (51)	$ (59)