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Stockholders' Equity - Accumulated Other Comprehensive Income (Loss) by Component Net of Tax (Detail) - USD ($) $ in Millions	12 Months Ended
	Apr. 26, 2019	Apr. 27, 2018	Apr. 28, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balances	$ 2,276	$ 2,949	$ 2,881
OCI before reclassifications, net of tax	29	(40)
Amounts reclassified from AOCI, net of tax	(2)	(1)
Other comprehensive income (loss):	27	(41)	2
Balances	1,090	2,276	2,949
Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balances	(27)	(29)
OCI before reclassifications, net of tax	(7)	2
Amounts reclassified from AOCI, net of tax	0	0
Other comprehensive income (loss):	(7)	2
Balances	(34)	(27)	(29)
Defined Benefit Obligation Adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balances	0	0
OCI before reclassifications, net of tax	(2)	1
Amounts reclassified from AOCI, net of tax	(1)	(1)
Other comprehensive income (loss):	(3)	0
Balances	(3)	0	0
Unrealized Gains (Losses) on Available-for-Sale Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balances	(43)	0
OCI before reclassifications, net of tax	36	(43)
Amounts reclassified from AOCI, net of tax	0	0
Other comprehensive income (loss):	36	(43)
Balances	(7)	(43)	0
Unrealized Gains (Losses) on Derivative Instruments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balances	0	0
OCI before reclassifications, net of tax	2	0
Amounts reclassified from AOCI, net of tax	(1)	0
Other comprehensive income (loss):	1	0
Balances	1	0	0
AOCI Attributable to Parent
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balances	(70)	(29)	(31)
Other comprehensive income (loss):	27	(41)	2
Balances	$ (43)	$ (70)	$ (29)

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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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