Stockholders' Equity - Accumulated Other Comprehensive Income (Loss) by Component Net of Tax (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Oct. 28, 2016	Oct. 30, 2015	Oct. 28, 2016	Oct. 30, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance			$ 2,881
OCI before reclassifications, net of tax			(10)
Amounts reclassified from AOCI, net of tax			0
Other comprehensive loss	$ (10)	$ (1)	(10)	$ (11)
Ending balance	2,789		2,789
Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance			(19)
OCI before reclassifications, net of tax			(11)
Amounts reclassified from AOCI, net of tax			0
Other comprehensive loss			(11)
Ending balance	(30)		(30)
Defined Benefit Obligation Adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance			(16)
OCI before reclassifications, net of tax			0
Amounts reclassified from AOCI, net of tax			1
Other comprehensive loss			1
Ending balance	(15)		(15)
Unrealized Gains (Losses) on Available-for-Sale Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance			6
OCI before reclassifications, net of tax			(2)
Amounts reclassified from AOCI, net of tax			0
Other comprehensive loss			(2)
Ending balance	4		4
Unrealized Gains (Losses) on Derivative Instruments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance			(2)
OCI before reclassifications, net of tax			3
Amounts reclassified from AOCI, net of tax			(1)
Other comprehensive loss			2
Ending balance	0		0
AOCI Attributable to Parent
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance			(31)
Ending balance	$ (41)		$ (41)