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Variable Interest Entities Variable Interest Entities (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2012
Aug. 09, 2013
Jan. 17, 2012
VIE Financing          
Membership interests of VIE subject to mandatory redemption $ 50 $ 50   $ 40  
Total liabilities 1,362 1,393     1,000
Interest expense 64 50 34    
SCCG
          
VIE Financing          
Face Amount       360  
JSCCG
          
VIE Financing          
Face Amount         900
Holdco
          
VIE Financing          
Face Amount         100
Accrued interest of VIE
          
VIE Financing          
Total liabilities 12 12      
Current portion of membership interests of VIE subject to mandatory redemption
          
VIE Financing          
Total liabilities 2 2      
Current maturities of long-term debt of VIE
          
VIE Financing          
Total liabilities 32 30      
Total current liabilities of VIE
          
VIE Financing          
Total liabilities 46 44      
Membership interests of VIE subject to mandatory redemption
          
VIE Financing          
Total liabilities 37 38      
Long-term debt of VIE
          
VIE Financing          
Total liabilities $ 1,279 $ 1,311