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Stockholders' Equity - Accumulated Other Comprehensive Income (Loss) by Component Net of Tax (Detail) - USD ($) $ in Millions	12 Months Ended
	Apr. 27, 2018	Apr. 28, 2017	Apr. 29, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balances	$ 2,780	$ 2,881	$ 3,414
OCI before reclassifications, net of tax	(40)	8
Amounts reclassified from AOCI, net of tax	(1)	(6)
Other comprehensive income (loss):	(41)	2	(7)
Balances	2,067	2,780	2,881
Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balances	(29)	(19)
OCI before reclassifications, net of tax	2	(10)
Amounts reclassified from AOCI, net of tax	0	0
Other comprehensive income (loss):	2	(10)
Balances	(27)	(29)	(19)
Defined Benefit Obligation Adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balances	0	(16)
OCI before reclassifications, net of tax	1	16
Amounts reclassified from AOCI, net of tax	(1)	0
Other comprehensive income (loss):	0	16
Balances	0	0	(16)
Unrealized Gains (Losses) on Available-for-Sale Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balances	0	6
OCI before reclassifications, net of tax	(43)	(6)
Amounts reclassified from AOCI, net of tax	0	0
Other comprehensive income (loss):	(43)	(6)
Balances	(43)	0	6
Unrealized Gains (Losses) on Derivative Instruments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balances	0	(2)
OCI before reclassifications, net of tax	0	8
Amounts reclassified from AOCI, net of tax	0	(6)
Other comprehensive income (loss):	0	2
Balances	0	0	(2)
AOCI Attributable to Parent
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balances	(29)	(31)	(24)
Other comprehensive income (loss):	(41)	2	(7)
Balances	$ (70)	$ (29)	$ (31)

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

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 55
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=84158357&loc=d3e1436-108581

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

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

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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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