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Stockholders' Equity - Amounts Reclassified Out of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Jan. 29, 2016
Jan. 23, 2015
Jan. 29, 2016
Jan. 23, 2015
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Operating expenses $ 690 $ 775 $ 2,271 $ 2,343
Other income (expense), net (2) 0 0 0
Net revenues 1,386 1,551 4,166 4,583
Net income 153 177 237 425
Reclassification out of Accumulated Other Comprehensive Income        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Net income (2) (15) 1 (9)
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 0 0 2 0
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 0 (1) 0
Reclassification out of Accumulated Other Comprehensive Income | Realized Gains on Cash Flow Hedges        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Net revenues $ (2) $ (15) $ 0 $ (9)