Acquisitions - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Oct. 30, 2020	Oct. 25, 2019	Oct. 30, 2020	Oct. 25, 2019	Jul. 31, 2020	Apr. 24, 2020	Jul. 26, 2019	Apr. 26, 2019
Business Acquisition [Line Items]
Goodwill	$ 41,212		$ 41,212			$ 39,841
Purchase price contingent consideration	158	$ 7	158	$ 65
Gain related to change in amounts accrued for certain contingent liabilities for recent acquisition	132		132
Contingent consideration liabilities	461	260	461	260	$ 297	280	$ 269	$ 222
Other accrued expenses
Business Acquisition [Line Items]
Contingent consideration liabilities	342		342			112
Other liabilities
Business Acquisition [Line Items]
Contingent consideration liabilities	119		119			$ 168
All Business Acquisitions
Business Acquisition [Line Items]
Net assets acquired	539	272	539	272
Total assets acquired	577	324	577	324
Total liabilities assumed	38	52	38	52
Inventory		40		40
Goodwill	381	92	381	92
Purchase price contingent consideration			158	65
All Business Acquisitions | Technology-Based Intangible Assets
Business Acquisition [Line Items]
Intangible assets acquired	156	139	$ 156	$ 139
All Business Acquisitions | Technology-Based Intangible Assets | Minimum
Business Acquisition [Line Items]
Estimated useful life			8 years	8 years
All Business Acquisitions | Technology-Based Intangible Assets | Maximum
Business Acquisition [Line Items]
Estimated useful life			15 years	16 years
All Business Acquisitions | Customer-Related Intangible Assets
Business Acquisition [Line Items]
Intangible assets acquired	$ 13	$ 26	$ 13	$ 26
All Business Acquisitions | Customer-Related Intangible Assets | Minimum
Business Acquisition [Line Items]
Estimated useful life			8 years	8 years
All Business Acquisitions | Customer-Related Intangible Assets | Maximum
Business Acquisition [Line Items]
Estimated useful life			15 years	16 years