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Debt and Other Obligations Debt and Other Obligations - Credit Facility Agreements (Details)
Sep. 30, 2016
USD ($)
Credit_facilities
Sep. 30, 2015
USD ($)
Credit Facility Agreements    
Current borrowing capacity $ 150,000,000  
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  
Credit facility agreements borrowings outstanding $ 0 $ 0
Number of revolving credit facilities | Credit_facilities 3  
Revolving credit facility 3 $ 500,000,000  
Revolving credit facility 1 1,000,000,000  
Revolving Credit Facility 2 1,000,000,000  
Long-term Line of Credit, Borrowings 3 0  
Line of Credit Facility, Remaining Borrowing Capacity 3 0  
Long-term Line of Credit, Borrowings 1 0  
Line of Credit Facility, Remaining Borrowing Capacity 1 600,000,000  
Long-term Line of Credit, Borrowings 2 0  
Line of Credit Facility, Remaining Borrowing Capacity 2 500,000,000  
Line of Credit Facility, Remaining Borrowing Capacity 1,100,000,000  
Letter of Credit    
Credit Facility Agreements    
Amount of letters of credit outstanding 1,400,000,000 $ 1,100,000,000
Letters of Credit Outstanding, Amount 3 500,000,000  
Letters of Credit Outstanding, Amount 1 400,000,000  
Letter of Credit Outstanding, Amount 2 $ 500,000,000