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Restructuring - Termination Liability and Restructuring Reserve (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 Reserve [Roll Forward]
Beginning balance			$ 122
Charges	$ 97	$ 69	328	$ 264
Cash payments			(349)
Settled non-cash			(6)
Accrual adjustments		$ (3)	(13)	$ (8)
Ending balance	82		82
Employee Termination Benefits
Restructuring Reserve [Roll Forward]
Beginning balance			101
Charges			91
Cash payments			(118)
Settled non-cash			0
Accrual adjustments			(5)
Ending balance	69		69
Associated Costs
Restructuring Reserve [Roll Forward]
Beginning balance			9
Charges			223
Cash payments			(223)
Settled non-cash			0
Accrual adjustments			0
Ending balance	9		9
Asset Write-Downs
Restructuring Reserve [Roll Forward]
Beginning balance			0
Charges			6
Cash payments			0
Settled non-cash			(6)
Accrual adjustments			0
Ending balance	0		0
Other Costs
Restructuring Reserve [Roll Forward]
Beginning balance			12
Charges			8
Cash payments			(8)
Settled non-cash			0
Accrual adjustments			(8)
Ending balance	$ 4		$ 4