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Borrowings (Additional Information) (Details) - USD ($)
May 15, 2015
Oct. 27, 2018
Jul. 28, 2018
Debt Instrument [Line Items]      
Short-term debt   $ 7,241,000,000 $ 5,238,000,000
Derivative, notional amount   10,526,000,000 10,011,000,000
Line of credit facility, amount outstanding   0  
Unsecured revolving credit facility      
Debt Instrument [Line Items]      
Current borrowing capacity $ 3,000,000,000    
Additional credit facility upon agreement (up to) $ 2,000,000,000.0    
Unsecured revolving credit facility | Federal fund rate plus 0.50%      
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   6,750,000,000 6,750,000,000
Commercial paper      
Debt Instrument [Line Items]      
Commercial paper, maximum borrowing limit (up to)   10,000,000,000.0  
Short-term debt   $ 0 $ 0