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Borrowings (Additional Information) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Oct. 24, 2015
Oct. 25, 2014
Jul. 25, 2015
Debt Instrument [Line Items]      
Commercial paper, maximum borrowing limit $ 3,000    
Commercial paper outstanding, Description The Company had no commercial paper notes outstanding as of each of October 24, 2015 and July 25, 2015.    
Repayments of Senior Debt $ 852 $ 3  
Derivative, Notional Amount 15,419   $ 15,278
Commercial Paper 0   0
Derivatives designated as hedging instruments: | Interest rate derivatives      
Debt Instrument [Line Items]      
Derivative, Notional Amount 11,400   $ 11,400
Floating Rate Notes 3-month Libor Plus 0.05% Due September 2015 [Member]      
Debt Instrument [Line Items]      
Repayments of Senior Debt $ 850    
Interest rate based on % above pre-defined market rate 0.00%   0.05%
Unsecured revolving credit facility      
Debt Instrument [Line Items]      
Line of Credit Facility, Current Borrowing Capacity $ 3,000    
Maturity date May 15, 2020    
Line of Credit Facility, Interest Rate Description Any advances under the credit agreement will accrue interest at rates that are equal to, based on certain conditions, either (i) the highest of (a) the Federal Funds rate plus 0.50%, (b) Bank of America’s “prime rate” as announced from time to time, or (c) LIBOR or a comparable or successor rate which rate is approved by the Administrative Agent (“Eurocurrency Rate”) for an interest period of one-month plus 1.00%, or (ii) the Eurocurrency Rate, plus a margin that is based on the Company’s senior debt credit ratings as published by Standard & Poor’s Financial Services, LLC and Moody’s Investors Service, Inc., provided that in no event will the Eurocurrency Rate be less than zero. The credit agreement requires the Company to comply with certain covenants, including that it maintain an interest coverage ratio as defined in the agreement.    
Additional credit facility upon agreement $ 2,000    
Additional unsecured revolving credit facility maturity date May 15, 2022    
Unsecured revolving credit facility | Federal fund rate plus 0.50% [Member]      
Debt Instrument [Line Items]      
Interest rate based on % above pre-defined market rate 0.50%    
Unsecured revolving credit facility | One-month LIBOR plus 1%      
Debt Instrument [Line Items]      
Interest rate based on % above pre-defined market rate 1.00%