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Variable Interest Entities (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2013
Sep. 30, 2012
Jan. 17, 2012
Liabilities            
Current maturities of long-term debt of variable interest entities issued at par $ 41 $ 39        
Liabilities, Current 4,711 4,312        
Other long-term liabilities 2,548 2,308        
Long-term debt of variable interest entities, net 1,048 1,089        
VIE Financing            
Face Amount $ 40         $ 100
Rate of Return SHLLC 7.00%          
Accrued interest $ 10 11        
Accounts Payable and Accrued Liabilities   1        
Liabilities 39,893 38,842        
SCCG            
VIE Financing            
Face Amount       $ 360    
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 54 53        
Other long-term liabilities 23 25        
VIE Financing            
Accounts Payable and Accrued Liabilities 3 3        
Liabilities 1,125 1,167     $ 1,000  
Interest Expense $ (54) $ (56) $ (58)