XML 17 R55.htm IDEA: XBRL DOCUMENT v2.4.0.6
Debt and Other Obligations Credit Facility Agreements (Details) (USD $)
Jun. 30, 2012
Sep. 30, 2011
Line of Credit
    
Credit Facility Agreements    
Current borrowing capacity $ 150,000,000  
Credit facility agreements borrowings outstanding 0  
Revolving Credit Facilities
    
Credit Facility Agreements    
Current borrowing capacity 2,500,000,000  
Number of revolving credit facilities 3  
Revolving credit facility 1 500,000,000  
Revolving credit facility 2 1,000,000,000  
Revolving credit facility 3 1,000,000,000  
Letter of credit borrowing capacity 1,800,000,000  
Amount of letters of credit outstanding 1,200,000,000 575,000,000
Credit facility agreements borrowings outstanding $ 0