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Borrowings (Additional Information) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Feb. 22, 2016
Apr. 30, 2016
Oct. 24, 2015
Apr. 30, 2016
Apr. 25, 2015
Jul. 25, 2015
Debt Instrument [Line Items]            
Repayments of Senior Debt       $ 3,863 $ 507  
Commercial paper, maximum borrowing limit   $ 3,000   3,000    
Commercial Paper   0   0   $ 0
Derivative, Notional Amount   13,433   13,433   15,278
Line of Credit Facility, Amount Outstanding   0   0    
Derivatives designated as hedging instruments: | Interest rate derivatives            
Debt Instrument [Line Items]            
Derivative, Notional Amount   9,900   9,900   11,400
Floating Rate Notes 3-month Libor Plus 0.05% Due September 2015            
Debt Instrument [Line Items]            
Senior Notes   $ 0   0   $ 850
Repayments of Senior Debt     $ 850      
Interest rate based on % above pre-defined market rate   0.00%       0.05%
Fixed-Rate Notes, 5.5%, Due February 2016            
Debt Instrument [Line Items]            
Senior Notes   $ 0   0   $ 3,000
Repayments of Senior Debt $ 3,000          
Aggregate debt issuance in February 2016 [Member]            
Debt Instrument [Line Items]            
Senior Notes   7,000   7,000    
Unsecured revolving credit facility            
Debt Instrument [Line Items]            
Line of Credit Facility, Current Borrowing Capacity   3,000   $ 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   $ 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%