Other Income (Expense), Net (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jan. 26, 2018	Jan. 27, 2017	Jan. 26, 2018	Jan. 27, 2017
Nonoperating Income Expense [Abstract]
Interest income	$ 20	$ 10	$ 55	$ 31
Interest expense	(17)	(12)	(47)	(39)
Other income, net	11	2	17	7
Total other income (expense), net	$ 14	$ 0	$ 25	$ (1)