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Fair Value Measurements (Fair Value, Assets And Liabilities Measured On Recurring Basis) (Details) - USD ($)
$ in Millions
 3 Months Ended
Apr. 30, 2016
May. 02, 2015
Jan. 30, 2016
Oct. 31, 2015
Available-for-sale Securities, Gross Realized Gains $ 4 $ 0    
Assets:        
Cash and Cash Equivalents 1,267 649 $ 2,548  
Available-for-sale Securities 11 50 22  
Foreign Currency Cash Flow Hedge Asset at Fair Value 11 11 27  
Interest Rate Designated Fair Value Hedges 10 7 11  
Proceeds from Sale of Available-for-sale Securities, Equity 10      
Liabilities:        
Marketable Securities, Realized Gain (Loss) (3) 0    
Fair Value, Inputs, Level 1 [Member]        
Assets:        
Cash and Cash Equivalents 1,267 649 2,548  
Available-for-sale Securities 11 50 22  
Foreign Currency Cash Flow Hedge Asset at Fair Value 0   0  
Interest Rate Designated Fair Value Hedges 0 0 0  
Marketable Securities, Equity Securities, Current       $ 10
Liabilities:        
Foreign Currency Cash Flow Hedge Liability at Fair Value   0    
Fair Value, Inputs, Level 2 [Member]        
Assets:        
Cash and Cash Equivalents 0 0 0  
Available-for-sale Securities 0 0 0  
Foreign Currency Cash Flow Hedge Asset at Fair Value 11 11 27  
Interest Rate Designated Fair Value Hedges 10 7 11  
Fair Value, Inputs, Level 3 [Member]        
Assets:        
Cash and Cash Equivalents 0 0 0  
Available-for-sale Securities 0 0 0  
Foreign Currency Cash Flow Hedge Asset at Fair Value 0   0  
Interest Rate Designated Fair Value Hedges $ 0 0 $ 0  
Liabilities:        
Foreign Currency Cash Flow Hedge Liability at Fair Value   $ 0