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Borrowings - Additional Information (Detail) (USD $)
3 Months Ended 3 Months Ended 9 Months Ended
Apr. 26, 2014
Jul. 27, 2013
Apr. 26, 2014
Designated as Hedging Instrument
Interest Rate Derivatives
Jul. 27, 2013
Designated as Hedging Instrument
Interest Rate Derivatives
Apr. 26, 2014
Commercial Paper
Jul. 27, 2013
Commercial Paper
Apr. 26, 2014
Commercial Paper
Maximum
Apr. 26, 2014
Senior Notes
Apr. 26, 2014
Senior Notes Issued in March 2014
Apr. 26, 2014
Unsecured revolving credit facility
Debt Disclosure                    
ST debt financing program- Commercial paper notes (up to limit)         $ 0 $ 0 $ 3,000,000,000      
Repayments of Commercial Paper         1,000,000,000          
Repayments of Short-term Debt               3,300,000,000    
Senior Notes                 8,000,000,000  
Notional amount of derivatives 14,673,000,000 12,992,000,000 10,400,000,000 5,250,000,000            
Unsecured Revolving Credit Facility                   3,000,000,000
Unsecured revolving credit facility maturity date                   Feb. 17, 2017
Unsecured revolving credit facility- interest rate description Facility, Interest Rate Description                   either (i) the higher of the Federal Funds rate plus 0.50%, Bank of America's “prime rate” as announced from time to time, or one-month LIBOR plus 1.00%, or (ii) LIBOR plus a margin that is based on the Company's senior debt credit ratings
Interest Rate- Federal Funds rate plus 0.5%                   0.50%
Interest Rate- One-month LIBOR plus 1.00%                   1.00%
Line of Credit Facility, Amount Outstanding                   0
Available increases under the credit facility                   $ 2,000,000,000
Additional unsecured revolving credit facility maturity date                   Feb. 17, 2019