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Variable Interest Entities (Details) - USD ($)
$ in Millions
 12 Months Ended 348 Months Ended
Sep. 30, 2053
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2052
Sep. 30, 2013
Sep. 30, 2012
Liabilities              
Current maturities of long-term debt of variable interest entities issued at par   $ 35 $ 39        
Liabilities, Current   4,873 4,645        
Other long-term liabilities   1,211 1,485        
Long-term debt of variable interest entities, net   933 968        
VIE Financing              
Face Amount   $ 40       $ 360  
Rate of Return SHLLC   7.00%          
Accrued interest   $ 9 10        
Minimum payments on membership interests subject to mandatory redemption, due in next twelve months   1          
Minimum payments on membership interests subject to mandatory redemption, due in year two   1          
Minimum payments on membership interests subject to mandatory redemption, due in year three   1          
Minimum payments on membership interests subject to mandatory redemption, due in year four   1          
Minimum payments on membership interests subject to mandatory redemption, due in year five   1          
Minimum payments on membership interests subject to mandatory redemption, due thereafter   13          
Other Long-term Debt, Maturity, Year One   35          
Other Long-term Debt, Maturity, Year Two   37          
Other Long-term Debt, Maturity, Year Three   39          
Other Long-term Debt, Maturity, Year Four   40          
Other Long-term Debt, Maturity, Year Five   42          
Other Long-term Debt, Maturity, Year Six   781          
Long-term debt of variable interest entities (including current maturities)   927 989        
Amount of letters of credit outstanding   6          
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net   126 124        
Variable Interest Entity, Primary Beneficiary [Member]              
VIE Financing              
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net   6          
Portion at Other than Fair Value Measurement [Member]              
VIE Financing              
Long-term debt of variable interest entities (including current maturities)   968 1,007        
Lagoon Creek [Member]              
VIE Financing              
Amortization of reacquired rights   3          
Lagoon Creek [Member] | Scenario, Forecast              
VIE Financing              
Amortization of reacquired rights $ 2       $ 5    
Letter of Credit              
VIE Financing              
Amount of letters of credit outstanding   535 704        
SCCG              
VIE Financing              
Debt and Lease Obligation           $ 400  
Holdco              
VIE Financing              
Face Amount             $ 100
JSCCG              
VIE Financing              
Face Amount             900
Variable Interest Entity, Primary Beneficiary [Member]              
Liabilities              
Liabilities, Current   45 51        
Other long-term liabilities   17 18        
VIE Financing              
Accounts Payable and Accrued Liabilities   1 2        
Liabilities   995 1,037       $ 1,000
Interest Expense   $ 48 $ 50 $ 52