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Components of Long Term Debt (Details) - USD ($)
$ in Millions
Jan. 30, 2016
Jan. 31, 2015
Debt Instrument [Line Items]    
Deferred Finance Costs, Net $ 18 $ (13)
Unamortized debt discount 5 (7)
Long-term debt $ 2,792 2,780
Senior Notes    
Debt Instrument [Line Items]    
Effective Rate 4.88%  
Total senior debt $ 2,815 2,800
Senior Notes | Senior Notes Due 2017    
Debt Instrument [Line Items]    
Total senior debt $ 0 650
Senior Notes | Senior Notes Due 2021    
Debt Instrument [Line Items]    
Effective Rate 4.81%  
Total senior debt $ 650 650
Debt Instrument, Interest Rate, Stated Percentage 4.00%  
Senior Notes | Senior Notes Due Twenty Twenty Three [Member]    
Debt Instrument [Line Items]    
Effective Rate 3.25%  
Total senior debt $ 350 350
Debt Instrument, Interest Rate, Stated Percentage 3.25%  
Senior Notes | Senior Notes Due 2029    
Debt Instrument [Line Items]    
Effective Rate 7.36%  
Total senior debt $ 99 200
Debt Instrument, Interest Rate, Stated Percentage 7.25%  
Senior Notes | Senior Notes Due 2033    
Debt Instrument [Line Items]    
Effective Rate 6.05%  
Total senior debt $ 166 300
Debt Instrument, Interest Rate, Stated Percentage 6.00%  
Senior Notes | Four Point Seven Eight Percent Senior Note Due Twenty Twenty Three [Member] [Domain]    
Debt Instrument [Line Items]    
Effective Rate 4.78%  
Total senior debt $ 300 300
Debt Instrument, Interest Rate, Stated Percentage 4.75%  
Senior Notes | Senior Notes Due Twenty Twenty Five [Member]    
Debt Instrument [Line Items]    
Effective Rate 4.25%  
Total senior debt $ 650 0
Debt Instrument, Interest Rate, Stated Percentage 4.25%  
Senior Notes | Senior Notes Due 2037    
Debt Instrument [Line Items]    
Effective Rate 6.89%  
Total senior debt $ 150 350
Debt Instrument, Interest Rate, Stated Percentage 6.88%  
Senior Notes | Senior Notes Due Twenty Forty Five [Domain]    
Debt Instrument [Line Items]    
Effective Rate 5.57%  
Total senior debt $ 450 $ 0
Debt Instrument, Interest Rate, Stated Percentage 5.55%