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Borrowings (Additional Information) (Details) - USD ($)
May 15, 2015
Jul. 28, 2018
Jul. 29, 2017
Debt Instrument [Line Items]      
Derivative, notional amount   $ 10,011,000,000 $ 11,590,000,000
Unsecured Debt      
Debt Instrument [Line Items]      
Current borrowing capacity $ 3,000,000,000    
Additional credit facility upon agreement $ 2,000,000,000.0    
Line of credit facility, amounts outstanding   0  
Unsecured Debt | Federal Funds Rate      
Debt Instrument [Line Items]      
Three-month LIBOR plus this percentage 0.50%    
Unsecured Debt | LIBOR      
Debt Instrument [Line Items]      
Three-month LIBOR plus this percentage 1.00%    
Unsecured Debt | Eurodollar      
Debt Instrument [Line Items]      
Three-month LIBOR plus this percentage 0.00%    
Derivatives designated as hedging instruments: | Interest rate derivatives      
Debt Instrument [Line Items]      
Derivative, notional amount   6,750,000,000 $ 6,750,000,000
Commercial paper      
Debt Instrument [Line Items]      
Commercial paper, maximum borrowing limit   $ 10,000,000,000.0