Quarterly report pursuant to Section 13 or 15(d)

Financing Activities (Narrative) (Details)

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Financing Activities (Narrative) (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 1 Months Ended 3 Months Ended 9 Months Ended
May 28, 2011
Oct. 29, 2011
Oct. 30, 2010
Oct. 29, 2011
Oct. 30, 2010
Debt Instrument [Line Items]          
Debt repaid in period       $ 439 $ 76
Debt instrument, principal outstanding   612   612  
Decrease in interest payable effective rate 0.25%        
Effective interest rate of debt instrument 8.125%        
Maximum potential increase in debt interest rate due to potential downgrades in debt ratings 1.75%        
Maximum potential decrease in debt interest rate due to potential upgrades in debt ratings 0.25%        
Cash paid for repurchase of company debt     541   1,067
Amount of outstanding debt repurchased before maturity     500   1,000
Additional interest expense from early repurchase of debt     39   66
Shares of common stock acquired   8,162,400   8,162,400  
Cost of acquired shares   221   221  
Amount of authorizations unused   631   631  
Letter Of Credit Agreement Expiring On June 20, 2015 [Member]
          
Debt Instrument [Line Items]          
Line of credit facility, maximum borrowing capacity   1,500   1,500  
Line of credit facility, maximum borrowing capacity at Company's option       1,750  
Line of credit facility, expiration date       June 20, 2015  
Line of credit facility, amount outstanding   0   0  
Letter Of Credit Agreement Expiring On August 30, 2012 [Member]
          
Debt Instrument [Line Items]          
Line of credit facility, maximum borrowing capacity   2,000   2,000  
Line of credit facility, expiration date       August 30, 2012  
Line of credit facility, amount outstanding   $ 0   $ 0