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Stockholders' Equity - Accumulated Other Comprehensive Income (Loss) by Component Net of Tax (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Oct. 26, 2018	Oct. 27, 2017	Oct. 26, 2018	Oct. 27, 2017
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning balance			$ 2,276
Other comprehensive income (loss), net of tax			(4)
Amounts reclassified from AOCI, net of tax			(1)
Other comprehensive income (loss)	$ (5)	$ (6)	(5)	$ 10
Ending balance	1,530		1,530
Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning balance			(27)
Other comprehensive income (loss), net of tax			(3)
Amounts reclassified from AOCI, net of tax			0
Other comprehensive income (loss)			(3)
Ending balance	(30)		(30)
Defined Benefit Obligation Adjustments
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning balance			0
Other comprehensive income (loss), net of tax			0
Amounts reclassified from AOCI, net of tax			(1)
Other comprehensive income (loss)			(1)
Ending balance	(1)		(1)
Unrealized Gains (Losses) on Available-for-Sale Securities
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning balance			(43)
Other comprehensive income (loss), net of tax			(1)
Amounts reclassified from AOCI, net of tax			0
Other comprehensive income (loss)			(1)
Ending balance	(44)		(44)
Accumulated Other Comprehensive Income (Loss) Attributable to Parent
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning balance			(70)
Ending balance	$ (75)		$ (75)

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Amount after tax, before reclassification adjustments, of other comprehensive income (loss), attributable to parent.

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Amount after tax of other comprehensive income (loss) attributable to parent entity.

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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