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Employee Benefit Plans (Summary Of Stock Option Activity) (Details) - $ / shares
shares in Millions
9 Months Ended 12 Months Ended
Apr. 30, 2016
Jul. 25, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]    
Beginning balance, Number Outstanding, options 103 187
Assumed from acquisitions 18 1
Exercised (25) (71)
Canceled/forfeited/expired (13) (14)
Ending balance, Number Outstanding, options 83 103
Weighted-Average Exercise Price per Share, Beginning Balance, dollars per share $ 28.68 $ 26.03
Assumed from acquisitions, Weighted-Average Exercise Price per Share, dollars per share 5.14 2.60
Exercised, Weighted-Average Exercise Price per Share, dollars per share 19.60 21.15
Canceled/forfeited/expired, Weighted-Average Exercise Price per Share, dollars per share 29.62 29.68
Weighted-Average Exercise Price per Share, Ending Balance, dollars per share $ 26.16 $ 28.68