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Fair Value Measurements (Fair Value, Assets And Liabilities Measured On Recurring Basis) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jul. 29, 2017
Jul. 30, 2016
Apr. 30, 2016
Jul. 29, 2017
Jul. 30, 2016
Jan. 28, 2017
Available-for-sale Securities, Gross Realized Gains       $ 0 $ 4  
Assets:            
Cash and Cash Equivalents $ 1,360 $ 1,273   1,360 1,273 $ 1,934
Available-for-sale Securities 6 8   6 8 5
Foreign Currency Cash Flow Hedge Asset at Fair Value 8 16   8 16 18
Interest Rate Fair Value Hedges 2 8   2 8 2
Proceeds from Sale of Available-for-sale Securities, Equity     $ 10      
Liabilities:            
Foreign Currency Cash Flow Hedge Liability at Fair Value 11     11   1
Marketable Securities, Realized Gain (Loss) 0 0 $ (3) 0 (3)  
Fair Value, Inputs, Level 1 [Member]            
Assets:            
Cash and Cash Equivalents 1,360 1,273   1,360 1,273 1,934
Available-for-sale Securities 6 8   6 8 5
Foreign Currency Cash Flow Hedge Asset at Fair Value 0 0   0 0 0
Interest Rate Fair Value Hedges 0 0   0 0 0
Liabilities:            
Foreign Currency Cash Flow Hedge Liability at Fair Value 0     0   0
Fair Value, Inputs, Level 2 [Member]            
Assets:            
Cash and Cash Equivalents 0 0   0 0 0
Available-for-sale Securities 0 0   0 0 0
Foreign Currency Cash Flow Hedge Asset at Fair Value 8 16   8 16 18
Interest Rate Fair Value Hedges 2 8   2 8 2
Liabilities:            
Foreign Currency Cash Flow Hedge Liability at Fair Value 11     11   1
Fair Value, Inputs, Level 3 [Member]            
Assets:            
Cash and Cash Equivalents 0 0   0 0 0
Available-for-sale Securities 0 0   0 0 0
Foreign Currency Cash Flow Hedge Asset at Fair Value 0 0   0 0 0
Interest Rate Fair Value Hedges 0 $ 0   0 $ 0 0
Liabilities:            
Foreign Currency Cash Flow Hedge Liability at Fair Value $ 0     $ 0   $ 0