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Long-term Debt (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Jul. 30, 2016
Jan. 28, 2017
Jan. 30, 2016
Jan. 31, 2015
Interest Paid   $ 387 $ 317 $ 328
Proceeds from Debt, Net of Issuance Costs   692 988 0
Repayments of Long-term Debt   742 0 213
Gains (Losses) on Extinguishment of Debt   (36) $ 0 $ 0
Fixed Rate 6.90% Notes Due July 2017 [Member]        
Extinguishment of Debt, Amount   700    
Repayments of Long-term Debt   742    
Gains (Losses) on Extinguishment of Debt $ (36)      
Extinguishment of Debt, Gain (Loss), Net of Tax (22)      
Gain (Loss) recognized on discontinuation of Fair Value Hedges $ 7      
Fixed Rate 6.75% Notes Due July 2036 [Member]        
Debt instrument, face amount   $ 700    
Debt Instrument, Interest Rate, Stated Percentage   6.75%    
Proceeds from Debt, Net of Issuance Costs   $ 692    
Debt Issuance Cost   $ 8