Goodwill and Other Intangible Assets - Carrying Amount and Accumulated Amortization of Intangible Assets (Details) - USD ($) $ in Millions	Jan. 24, 2020	Apr. 26, 2019
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 28,158	$ 29,004
Accumulated Amortization	(9,284)	(9,048)
IPR&D
Indefinite-lived Intangible Assets [Line Items]
Gross Carrying Amount, Indefinite-lived	582	604
Customer-related
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	16,971	16,944
Accumulated Amortization	(4,824)	(4,095)
Purchased technology and patents
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	10,640	11,405
Accumulated Amortization	(4,178)	(4,570)
Trademarks and tradenames
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	464	570
Accumulated Amortization	(228)	(324)
Other
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	83	85
Accumulated Amortization	$ (54)	$ (59)