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Variable Interest Entities Variable Interest Entities (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Aug. 09, 2013
Jan. 17, 2012
Variable Interest Entities        
SSSL's former ownership interest     90.00%  
orginal lease term     31 years  
Initial liability     $ 400  
VIE Financing        
Lease term     20 years  
Membership interests of VIE subject to mandatory redemption 40 0 40  
Total liabilities 1,393 1,004   1,000
Interest expense 50 34    
SCCG
        
VIE Financing        
Face amount     360  
JSCCG
        
VIE Financing        
Face amount       900
Holdco
        
VIE Financing        
Face amount       100
Interest Payable, Current
        
VIE Financing        
Total liabilities 12 10    
Accounts payable and accrued liabilities
        
VIE Financing        
Total liabilities 2 0    
Other Long-term Debt, Current
        
VIE Financing        
Total liabilities 30 13    
Liabilities, Current
        
VIE Financing        
Total liabilities 44 23    
Other long-term liabilities
        
VIE Financing        
Total liabilities 38 0    
Long-term debt of variable interest entities
        
VIE Financing        
Total liabilities $ 1,311 $ 981