CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jan. 27, 2017	Jan. 29, 2016	Jan. 27, 2017	Jan. 29, 2016
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 146	$ 153	$ 319	$ 237
Other comprehensive income (loss):
Foreign currency translation adjustments	(3)	(5)	(14)	(7)
Defined benefit obligations:
Defined benefit obligation adjustments	25	0	25	0
Reclassification adjustments related to defined benefit obligations	0	0	1	2
Income tax effect	(10)	0	(10)	0
Unrealized gains (losses) on available-for-sale securities:
Unrealized holding losses arising during the period	(8)	(2)	(10)	(11)
Reclassification adjustments for gains included in net income	0	0	0	(1)
Unrealized gains on cash flow hedges:
Unrealized holding gains arising during the period	5	3	8	0
Reclassification adjustments for gains included in net income	(5)	(2)	(6)	0
Other comprehensive income (loss):	4	(6)	(6)	(17)
Comprehensive income	$ 150	$ 147	$ 313	$ 220