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Fair Value Measurements (Fair Value, Assets And Liabilities Measured On Recurring Basis) (Details) - USD ($)
$ in Millions
Oct. 31, 2015
Aug. 01, 2015
Jan. 31, 2015
Nov. 01, 2014
Aug. 02, 2014
Feb. 01, 2014
Assets:            
Cash and Cash Equivalents $ 1,311   $ 1,681 $ 745    
Available-for-sale Securities 13          
Foreign Currency Cash Flow Hedge Asset at Fair Value 27   21      
Interest Rate Designated Fair Value Hedges 10   12 5    
Liabilities:            
Guarantees, Fair Value Disclosure 0 $ 0 1 1 $ 1 $ 1
Foreign Currency Cash Flow Hedge Liability at Fair Value       10    
Fair Value, Inputs, Level 1 [Member]            
Assets:            
Cash and Cash Equivalents 1,311   1,681 745    
Available-for-sale Securities 13          
Foreign Currency Cash Flow Hedge Asset at Fair Value 0   0      
Interest Rate Designated Fair Value Hedges 0   0 0    
Liabilities:            
Guarantees, Fair Value Disclosure     0 0    
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          
Foreign Currency Cash Flow Hedge Asset at Fair Value 27   21      
Interest Rate Designated Fair Value Hedges 10   12 5    
Liabilities:            
Guarantees, Fair Value Disclosure     0 0    
Foreign Currency Cash Flow Hedge Liability at Fair Value       10    
Fair Value, Inputs, Level 3 [Member]            
Assets:            
Cash and Cash Equivalents 0   0 0    
Available-for-sale Securities 0          
Foreign Currency Cash Flow Hedge Asset at Fair Value 0   0      
Interest Rate Designated Fair Value Hedges $ 0   0 0    
Liabilities:            
Guarantees, Fair Value Disclosure     $ 1 1    
Foreign Currency Cash Flow Hedge Liability at Fair Value       $ 0