CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Oct. 30, 2015	Oct. 24, 2014	Oct. 30, 2015	Oct. 24, 2014
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 114	$ 160	$ 84	$ 248
Other comprehensive income (loss):
Foreign currency translation adjustments	(1)	(10)	(2)	(11)
Defined benefit obligations:
Defined benefit obligation adjustments	0	0	0	2
Reclassification adjustments related to defined benefit obligations	1	0	2	0
Unrealized gains (losses) on available-for-sale securities:
Unrealized holding gains (losses) arising during the period		1	(9)	(1)
Reclassification adjustments for gains included in net income	(1)		(1)
Unrealized gains (losses) on cash flow hedges:
Unrealized holding losses arising during the period	(1)	(3)	(3)	(4)
Reclassification adjustments for losses included in net income	1	4	2	6
Other comprehensive loss	(1)	(8)	(11)	(8)
Comprehensive income	$ 113	$ 152	$ 73	$ 240