Restructuring - Narrative (Details) - Enterprise Excellence - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jan. 24, 2020	Jan. 25, 2019	Jan. 24, 2020	Jan. 25, 2019
Restructuring Cost and Reserve [Line Items]
Charges	$ 97	$ 69	$ 328	$ 264
Accrual adjustments		3	13	8
Cost of products sold
Restructuring Cost and Reserve [Line Items]
Charges	50	21	117	58
Selling, general, and administrative expense
Restructuring Cost and Reserve [Line Items]
Charges	34	$ 19	111	$ 86
Minimum | Pre-tax exit and disposal costs and other
Restructuring Cost and Reserve [Line Items]
Expected cost	1,600		1,600
Maximum | Pre-tax exit and disposal costs and other
Restructuring Cost and Reserve [Line Items]
Expected cost	$ 1,800		$ 1,800