Segment and Geographic Information - Schedule of Net Sales to External Customers and Property, Plant, and Equipment, Net, by Geographic Region (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Apr. 24, 2020	Jan. 24, 2020	Oct. 25, 2019	Jul. 26, 2019	Apr. 26, 2019	Jan. 25, 2019	Oct. 26, 2018	Jul. 27, 2018	Apr. 24, 2020	Apr. 26, 2019	Apr. 27, 2018
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 5,998	$ 7,717	$ 7,706	$ 7,493	$ 8,146	$ 7,546	$ 7,481	$ 7,384	$ 28,913	$ 30,557	$ 29,953
Property, plant, and equipment, net	4,828				4,675				4,828	4,675
Ireland
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									85	91	85
Property, plant, and equipment, net	164				156				164	156
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									14,919	16,194	15,875
Property, plant, and equipment, net	3,459				3,122				3,459	3,122
Rest of world
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									13,909	14,272	13,993
Property, plant, and equipment, net	1,205				1,397				1,205	1,397
Total other countries, excluding Ireland
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									28,828	30,466	$ 29,868
Property, plant, and equipment, net	$ 4,664				$ 4,519				$ 4,664	$ 4,519