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Stockholders' Equity - Reconciliation of Retained Earnings (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Oct. 30, 2015
Oct. 24, 2014
Oct. 30, 2015
Oct. 24, 2014
Retained Earnings Adjustments [Line Items]        
Beginning balance     $ 53  
Net income $ 114 $ 160 84 $ 248
Repurchases of common stock     (613)  
Dividends paid     (107) (105)
Ending balance $ 0   0  
Retained Earnings        
Retained Earnings Adjustments [Line Items]        
Repurchases of common stock     (114)  
Dividends paid     $ (23) $ (53)