Stockholders' Equity - Accumulated Other Comprehensive Income (Loss) by Component Net of Tax (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Oct. 30, 2015	Oct. 24, 2014	Oct. 30, 2015	Oct. 24, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance			$ (24)
OCI before reclassifications, net of tax			(14)
Amounts reclassified from AOCI, net of tax			3
Other comprehensive loss	$ (1)	$ (8)	(11)	$ (8)
Ending balance	(35)		(35)
Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance			(23)
OCI before reclassifications, net of tax			(2)
Amounts reclassified from AOCI, net of tax			0
Other comprehensive loss			(2)
Ending balance	(25)		(25)
Defined Benefit Obligation Adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance			(13)
OCI before reclassifications, net of tax			0
Amounts reclassified from AOCI, net of tax			2
Other comprehensive loss			2
Ending balance	(11)		(11)
Unrealized Gains (Losses) on Available-for-Sale Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance			11
OCI before reclassifications, net of tax			(9)
Amounts reclassified from AOCI, net of tax			(1)
Other comprehensive loss			(10)
Ending balance	1		1
Unrealized Gains (Losses) on Derivative Instruments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance			1
OCI before reclassifications, net of tax			(3)
Amounts reclassified from AOCI, net of tax			2
Other comprehensive loss			(1)
Ending balance	$ 0		$ 0