Acquisitions - Narrative (Details) - USD ($)	3 Months Ended
	Jul. 31, 2020	Jul. 26, 2019	Apr. 24, 2020	Apr. 26, 2019
Business Acquisition [Line Items]
Gain related to change in amounts accrued for certain contingent liabilities for recent acquisition	$ 132,000,000
Goodwill	40,714,000,000		$ 39,841,000,000
Purchase price contingent consideration	0	$ 58,000,000
Contingent consideration liabilities	297,000,000	269,000,000	280,000,000	$ 222,000,000
Other accrued expenses
Business Acquisition [Line Items]
Contingent consideration liabilities	225,000,000		112,000,000
Other liabilities
Business Acquisition [Line Items]
Contingent consideration liabilities	72,000,000		$ 168,000,000
IPR&D
Business Acquisition [Line Items]
In-process research and development acquired in connection with asset acquisition	$ 10,000,000	0
All Business Acquisitions
Business Acquisition [Line Items]
Net assets acquired		206,000,000
Total assets acquired		247,000,000
Total liabilities assumed		41,000,000
Inventory		40,000,000
Goodwill		65,000,000
Purchase price contingent consideration		58,000,000
All Business Acquisitions | Technology-Based Intangible Assets
Business Acquisition [Line Items]
Intangible assets acquired		$ 91,000,000
Estimated useful life		8 years
All Business Acquisitions | Customer-Related Intangible Assets
Business Acquisition [Line Items]
Intangible assets acquired		$ 26,000,000
Estimated useful life		8 years