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Borrowings (Additional Information) (Details) - USD ($)
6 Months Ended
May 15, 2015
Jan. 26, 2019
Feb. 18, 2019
Jul. 28, 2018
Debt Instrument [Line Items]        
Short-term debt   $ 9,737,000,000   $ 5,238,000,000
Derivative, notional amount   11,118,000,000   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        
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
Commercial paper | Subsequent event        
Debt Instrument [Line Items]        
Short-term debt     $ 2,000,000,000  
Fixed-Rate Notes, 4.95%, Due February 2019        
Debt Instrument [Line Items]        
Repayments of senior notes   $ 2,000,000,000