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Supplemental Financial Information - Supplemental Cash Flows, Non-Cash Investing and Financing Activities (Detail) - USD ($) $ in Millions	9 Months Ended
	Jan. 25, 2019	Jan. 26, 2018
Non-cash Investing and Financing Activities:
Capital expenditures incurred but not paid	$ 6	$ 19
Non-cash extinguishment of sale-leaseback financing obligations	0	130
Supplemental Cash Flow Information:
Income taxes paid, net of refunds	150	51
Interest paid	$ 41	$ 45

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Future cash outflow to pay for purchases of fixed assets that have occurred.

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