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Debt (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Jan. 30, 2016
Oct. 31, 2015
Aug. 01, 2015
May. 02, 2015
Jan. 30, 2016
Jan. 31, 2015
Feb. 01, 2014
Long-term Debt, Fair Value $ 2,800       $ 2,800 $ 3,100  
Repayments of Debt         1,085    
Gains (Losses) on Extinguishment of Debt 0 $ (38) $ (131) $ 0 169 0 $ 0
Payments of Debt Extinguishment Costs         163 0 $ 0
Write off of Deferred Debt Issuance Cost         $ 6    
Line of Credit Facility, Description         1.0    
Proceeds from Lines of Credit         $ 400    
Line of Credit Facility, Interest Rate Description         0.0127    
Trade Letters of Credit and Stand by Letters of Credit              
Line of credit facilty outstanding amount 35       $ 35    
Senior Notes Due Twenty Forty Five [Domain] | Senior Notes              
Senior Notes 450       450    
Senior Notes Due Twenty Twenty Five [Member] | Senior Notes              
Senior Notes 650       650    
Senior Notes              
Senior Notes $ 2,815       $ 2,815 2,800  
Long-term Debt, Weighted Average Interest Rate 4.88%       4.88%    
Senior Notes | Senior Notes Due Twenty Forty Five [Domain]              
Senior Notes $ 450       $ 450 0  
Long-term Debt, Weighted Average Interest Rate 5.57%       5.57%    
Debt instrument, interest rate 5.55%       5.55%    
Senior Notes | Senior Notes Due Twenty Twenty Five [Member]              
Senior Notes $ 650       $ 650 0  
Long-term Debt, Weighted Average Interest Rate 4.25%       4.25%    
Debt instrument, interest rate 4.25%       4.25%    
Senior Notes | Senior Notes Due Twenty Seventeen [Member]              
Senior Notes $ 0       $ 0 650  
Senior Notes | Four Point Seven Eight Percent Senior Note Due Twenty Twenty Three [Member] [Domain]              
Senior Notes $ 300       $ 300 300  
Long-term Debt, Weighted Average Interest Rate 4.78%       4.78%    
Debt instrument, interest rate 4.75%       4.75%    
Senior Notes | Senior Notes Due Twenty Twenty Three [Member]              
Senior Notes $ 350       $ 350 350  
Long-term Debt, Weighted Average Interest Rate 3.25%       3.25%    
Debt instrument, interest rate 3.25%       3.25%    
Senior Notes | Senior Notes Due 2021              
Senior Notes $ 650       $ 650 650  
Long-term Debt, Weighted Average Interest Rate 4.81%       4.81%    
Debt instrument, interest rate 4.00%       4.00%    
Senior Notes | Senior Notes Due Twenty Twenty Nine [Member]              
Senior Notes $ 99       $ 99 200  
Long-term Debt, Weighted Average Interest Rate 7.36%       7.36%    
Debt instrument, interest rate 7.25%       7.25%    
Senior Notes | Senior Notes Due Twenty Thirty Three [Member]              
Senior Notes $ 166       $ 166 300  
Long-term Debt, Weighted Average Interest Rate 6.05%       6.05%    
Debt instrument, interest rate 6.00%       6.00%    
Senior Notes | Senior Notes Due Twenty Thirty Seven [Member]              
Senior Notes $ 150       $ 150 $ 350  
Long-term Debt, Weighted Average Interest Rate 6.89%       6.89%    
Debt instrument, interest rate 6.88%       6.88%