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Borrowings - Additional Information (Details) - USD ($)
May 15, 2015
Jul. 27, 2019
Jul. 28, 2018
Debt Instrument [Line Items]      
Derivative, notional amount   $ 8,754,000,000 $ 10,011,000,000
Unsecured Debt      
Debt Instrument [Line Items]      
Current borrowing capacity $ 3,000,000,000.0    
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]      
Basis spread on variable rate 0.50%    
Unsecured Debt | LIBOR      
Debt Instrument [Line Items]      
Basis spread on variable rate 1.00%    
Unsecured Debt | Eurrocurrency Rate      
Debt Instrument [Line Items]      
Basis spread on variable rate 0.00%    
Derivatives designated as hedging instruments | Interest rate derivatives      
Debt Instrument [Line Items]      
Derivative, notional amount   4,500,000,000 $ 6,750,000,000
Commercial paper      
Debt Instrument [Line Items]      
Commercial paper, maximum borrowing limit   $ 10,000,000,000.0