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Debt and Other Obligations Debt and Other Obligations - Credit Facility Agreements (Details)
Sep. 30, 2021
USD ($)
Credit_facilities
Sep. 30, 2020
USD ($)
Credit Facility Agreements    
Borrowings under U.S. Treasury credit facility $ 0  
Revolving Credit Facilities    
Credit Facility Agreements    
Current borrowing capacity 2,650,000,000  
Credit facility agreements borrowings outstanding $ 0  
Number of revolving credit facilities | Credit_facilities 4  
Revolving Credit Facility 4 $ 150,000,000  
Revolving credit facility 3 1,000,000,000  
Revolving credit facility 1 500,000,000  
Revolving Credit Facility 2 1,000,000,000  
Long-term Line of Credit, Borrowings 4 0  
Long-term Line of Credit, Borrowings 1 0  
Long-term Line of Credit, Borrowings 2 0  
Line of Credit Facility, Remaining Borrowing Capacity 4 699,000,000  
Line of Credit Facility, Remaining Borrowing Capacity 2 672,000,000  
Line of Credit Facility, Remaining Borrowing Capacity 3 112,000,000  
Line of Credit Facility, Remaining Borrowing Capacity 1 0  
Line of Credit Facility, Remaining Borrowing Capacity 1,483,000,000  
Letter of Credit    
Credit Facility Agreements    
Amount of letters of credit outstanding 1,167,000,000 $ 1,500,000,000
Letters of Credit Outstanding, Amount 4 38,000,000  
Letters of Credit Outstanding, Amount 3 328,000,000  
Letters of Credit Outstanding, Amount 1 500,000,000  
Letter of Credit Outstanding, Amount 2 $ 301,000,000