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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jan. 25, 2019	Jan. 26, 2018	Jan. 25, 2019	Jan. 26, 2018
Statement Of Income And Comprehensive Income [Abstract]
Net income (loss)	$ 249	$ (479)	$ 773	$ (174)
Other comprehensive income (loss):
Foreign currency translation adjustments	(1)	(5)	(4)	3
Defined benefit obligations:
Reclassification adjustments related to defined benefit obligations	(1)	(1)	(2)	(2)
Income tax effect	1	0	1	1
Unrealized gains (losses) on available-for-sale securities:
Unrealized holding gains (losses) arising during the period	8	(17)	7	(15)
Other comprehensive income (loss)	7	(23)	2	(13)
Comprehensive income (loss)	$ 256	$ (502)	$ 775	$ (187)

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