Goodwill and Other Intangible Assets - Carrying Amount and Accumulated Amortization of Intangible Assets (Details) - USD ($) $ in Millions	Jul. 31, 2020	Apr. 24, 2020
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 28,408	$ 28,244
Accumulated Amortization	(10,179)	(9,704)
IPR&D
Indefinite-lived Intangible Assets [Line Items]
Gross Carrying Amount, Indefinite-lived	441	523
Customer-related
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	17,000	16,963
Accumulated Amortization	(5,321)	(5,065)
Purchased technology and patents
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	10,868	10,742
Accumulated Amortization	(4,567)	(4,354)
Trademarks and tradenames
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	465	464
Accumulated Amortization	(236)	(232)
Other
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	75	75
Accumulated Amortization	$ (55)	$ (53)