Stockholders' Equity - Amounts Reclassified Out of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Oct. 28, 2016	Oct. 30, 2015	Oct. 28, 2016	Oct. 30, 2015
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Operating expenses	$ 687	$ 739	$ 1,391	$ 1,581
Other income (expense), net	0	(1)	(1)	3
Net revenues	1,340	1,445	2,634	2,780
Total reclassifications	0	1	0	3
Reclassification out of Accumulated Other Comprehensive Income | Recognized Losses on Defined Benefit Obligations
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Operating expenses	1	1	1	2
Reclassification out of Accumulated Other Comprehensive Income | Realized Gains on Available-for-Sale Securities
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other income (expense), net	0	(1)	0	(1)
Reclassification out of Accumulated Other Comprehensive Income | Realized (Gains) Losses on Cash Flow Hedges
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net revenues	$ (1)	$ 1	$ (1)	$ 2