Supplemental Financial Information - Supplemental Cash Flows, Non-Cash Investing Activities (Detail) - USD ($) $ in Millions	6 Months Ended
	Oct. 25, 2019	Oct. 26, 2018
Non-cash Investing Activities:
Capital expenditures incurred but not paid	$ 6	$ 7
Supplemental Cash Flow Information:
Income taxes paid, net of refunds	260	104
Interest paid	$ 25	$ 26