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Borrowings - Additional Information (Details) - USD ($)
May 15, 2015
Oct. 26, 2019
Jul. 27, 2019
Debt Instrument [Line Items]      
Derivative, notional amount   $ 8,710,000,000 $ 8,754,000,000
Line of credit facility, amount outstanding   0  
Unsecured revolving credit facility      
Debt Instrument [Line Items]      
Current borrowing capacity $ 3,000,000,000.0    
Additional credit facility upon agreement (up to) $ 2,000,000,000.0    
Unsecured revolving credit facility | Federal Fund rate      
Debt Instrument [Line Items]      
Interest rate based on % above pre-defined market rate 0.50%    
Unsecured revolving credit facility | LIBOR      
Debt Instrument [Line Items]      
Interest rate based on % above pre-defined market rate 1.00%    
Unsecured revolving credit facility | Eurodollar      
Debt Instrument [Line Items]      
Interest rate based on % above pre-defined market rate 0.00%    
Derivatives designated as hedging instruments: | Interest rate derivatives      
Debt Instrument [Line Items]      
Derivative, notional amount   4,500,000,000 $ 4,500,000,000
Commercial paper      
Debt Instrument [Line Items]      
Commercial paper, maximum borrowing limit (up to)   $ 10,000,000,000.0