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Supplemental Financial Information - Cash, Cash Equivalents and Restricted Cash (Detail) - USD ($) $ in Millions	Jan. 25, 2019	Apr. 27, 2018	Jan. 26, 2018	Apr. 28, 2017
Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents [Abstract]
Cash	$ 2,162	$ 2,727
Cash equivalents	109	214
Cash and cash equivalents	2,271	2,941
Short-term restricted cash	4	5
Long-term restricted cash	1	1
Restricted cash	5	6
Cash, cash equivalents and restricted cash	$ 2,276	$ 2,947	$ 2,980	$ 2,450

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