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Borrowings (Additional Information) (Details) - USD ($)
May 15, 2015
Apr. 28, 2018
Jan. 27, 2018
Jul. 29, 2017
Debt Instrument [Line Items]        
Derivative, notional amount   $ 10,585,000,000   $ 11,590,000,000
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 | One-month LIBOR plus 1%        
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