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Variable Interest Entities Variable Interest Entities (Details) - USD ($)
$ in Millions
 3 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Sep. 30, 2020
Sep. 30, 2013
Sep. 30, 2012
Variable Interest Entities          
Other long-term liabilities $ 2,270   $ 2,548    
Accrued interest 23   10    
VIE Financing          
Face amount $ 40     $ 360  
Financial instruments subject to mandatory redemption, interest rate, stated percentage 7.00%        
Liabilities          
Current maturities of long-term debt of variable interest entities $ 41   41    
Long-term debt of variable interest entities, net 1,049   1,048    
Liabilities, Current 4,614   4,711    
Variable Interest Entity, Primary Beneficiary [Member]          
Variable Interest Entities          
Other long-term liabilities 23   23    
Liabilities 1,139   1,125   $ 1,000
Liabilities          
Liabilities, Current 67   54    
Interest Expense 13 $ 14      
Accounts Payable and Accrued Liabilities $ 3   $ 3    
JSCCG          
VIE Financing          
Face amount         900
Holdco          
VIE Financing          
Face amount         $ 100
SCCG          
VIE Financing          
Debt and Lease Obligation       $ 400