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Borrowings (Additional Information) (Details) - USD ($)
Mar. 30, 2017
May 15, 2015
Apr. 29, 2017
Mar. 31, 2017
Jan. 28, 2017
Jul. 30, 2016
Debt Instrument [Line Items]            
Short-term debt     $ 4,248,000,000     $ 4,160,000,000
Derivative, notional amount     11,760,000,000     15,414,000,000
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   $ 2,000,000,000.0        
Unsecured revolving credit facility | 364-Day Credit Agreement With Certain Institutional Lenders | Revolving Credit Facility            
Debt Instrument [Line Items]            
Credit facility maximum borrowing capacity $ 2,000,000,000          
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 | One-month LIBOR plus 1% | 364-Day Credit Agreement With Certain Institutional Lenders | Revolving Credit Facility            
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%        
Unsecured revolving credit facility | Federal Funds Rate | 364-Day Credit Agreement With Certain Institutional Lenders | Revolving Credit Facility            
Debt Instrument [Line Items]            
Interest rate based on % above pre-defined market rate 0.50%          
Derivatives designated as hedging instruments: | Interest rate derivatives            
Debt Instrument [Line Items]            
Derivative, notional amount     6,750,000,000     9,900,000,000
Commercial paper            
Debt Instrument [Line Items]            
Commercial paper, maximum borrowing limit       $ 10,000,000,000.0 $ 3,000,000,000.0  
Short-term debt     $ 2,000,000,000     $ 0