Quarterly report pursuant to Section 13 or 15(d)

Financing (Narrative) (Details)

 v2.3.0.11
Financing (Narrative) (Details) (USD $)
 1 Months Ended 6 Months Ended
Sep. 05, 2011
May 28, 2011
Jul. 30, 2011
Jul. 31, 2010
Debt repaid in period     $ 330,000,000 $ 76,000,000
Debt instrument, principal outstanding     612,000,000  
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       526,000,000
Amount of outstanding debt repurchased before maturity       500,000,000
Additional interest expense from early repurchase of debt       27,000,000
Shares of common stock acquired 1,361,000      
Cost of acquired shares 35,000,000      
Amount of authorizations unused 817,000,000      
Letter Of Credit Agreement Expiring On June 20, 2015 [Member]
        
Line of credit facility, maximum borrowing capacity     1,500,000,000  
Line of credit facility, maximum borrowing capacity at Company's option     1,750,000,000  
Line of credit facility, expiration date     June 20, 2015  
Line of credit facility, amount outstanding     0  
Letter Of Credit Agreement Expiring On August 30,2012 [Member]
        
Line of credit facility, maximum borrowing capacity     2,000,000,000  
Line of credit facility, expiration date     August 30, 2012  
Line of credit facility, amount outstanding     $ 0