CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jan. 29, 2016	Jan. 23, 2015	Jan. 29, 2016	Jan. 23, 2015
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 153	$ 177	$ 237	$ 425
Other comprehensive income (loss):
Foreign currency translation adjustments	(5)	(16)	(7)	(27)
Defined benefit obligations:
Defined benefit obligation adjustments	0	0	0	2
Reclassification adjustments related to defined benefit obligations	0	0	2	0
Unrealized gains (losses) on available-for-sale securities:
Unrealized holding losses arising during the period	(2)	(1)	(11)	(2)
Reclassification adjustments for gains included in net income	0	0	(1)	0
Unrealized gains (losses) on cash flow hedges:
Unrealized holding gains arising during the period	3	17	0	13
Reclassification adjustments for gains included in net income	(2)	(15)	0	(9)
Other comprehensive loss	(6)	(15)	(17)	(23)
Comprehensive income	$ 147	$ 162	$ 220	$ 402