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Employee Benefit Plans (Summary Of Restricted Stock And Stock Unit Activity) (Detail) (Restricted Stock And Stock Unit Awards [Member], USD $)
In Millions, except Per Share data, unless otherwise specified
6 Months Ended 12 Months Ended
Jan. 26, 2013
Jul. 28, 2012
Restricted Stock And Stock Unit Awards [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock Issued During Period, Shares, Restricted Stock Award, Gross 55 65
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]    
Beginning balance, restricted stock/stock units 128 116
Vested, restricted stock/stock units (33) (35)
Canceled/forfeited, restricted stock/stock units (5) (18)
Ending balance, restricted stock/stock units 145 128
Beginning balance, weighted-average grant date fair value per share $ 19.46 $ 21.50
Granted and assumed, weighted-average grant date fair value per share $ 17.35 $ 17.45
Vested, weighted-average grant date fair value per share $ 21.03 $ 21.94
Canceled/forfeited, weighted-average grant date fair value per share $ 18.33 $ 20.38
Ending balance, weighted-average grant date fair value per share $ 18.35 $ 19.46
Vested, aggregated fair market value $ 624 $ 580