Restructuring - Narrative (Details) - USD ($)	3 Months Ended		6 Months Ended
	Oct. 26, 2018	Oct. 27, 2017	Oct. 26, 2018	Oct. 27, 2017
Enterprise Excellence
Restructuring Cost and Reserve [Line Items]
Charges	$ 75,000,000		$ 195,000,000
Accrual (reversal of accrual) for restructuring reserves	(4,000,000)		2,000,000
Cost Synergies
Restructuring Cost and Reserve [Line Items]
Charges	0	$ 26,000,000	0	$ 45,000,000
Accrual (reversal of accrual) for restructuring reserves	(2,000,000)	(8,000,000)	(7,000,000)	(13,000,000)
Cost Synergies | Cost of products sold
Restructuring Cost and Reserve [Line Items]
Charges		7,000,000		12,000,000
Cost Synergies | Selling, general, and administrative expense
Restructuring Cost and Reserve [Line Items]
Charges		$ 3,000,000		$ 4,000,000
Minimum | Pre tax exit and disposal costs and other | Enterprise Excellence
Restructuring Cost and Reserve [Line Items]
Expected cost	1,600,000,000		1,600,000,000
Maximum | Pre tax exit and disposal costs and other | Enterprise Excellence
Restructuring Cost and Reserve [Line Items]
Expected cost	$ 1,800,000,000		$ 1,800,000,000