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Variable Interest Entities Variable Interest Entities (Details) - USD ($)
$ in Millions
Dec. 31, 2015
Sep. 30, 2015
Sep. 30, 2013
Sep. 30, 2012
VIE Financing        
Face amount     $ 40  
Membership interests of VIE subject to mandatory redemption $ 46 $ 47 $ 40  
Liabilities        
Total liabilities of VIE 1,330 1,315   $ 1,000
Long-term debt of VIE, net 1,233 1,233    
Financial instruments subject to mandatory redemption, interest rate, stated percentage     7.00%  
SCCG        
VIE Financing        
Face amount     $ 360  
JSCCG        
VIE Financing        
Face amount       900
Holdco        
VIE Financing        
Face amount       100
Issuance of membership interests       $ 100
Accrued interest of VIE        
Liabilities        
Total liabilities of VIE 27 12    
Current portion of membership interests of VIE subject to mandatory redemption        
Liabilities        
Total liabilities of VIE 2 2    
Current maturities of long-term debt of VIE        
Liabilities        
Total liabilities of VIE 33 33    
Total current liabilities of VIE        
Liabilities        
Total liabilities of VIE 62 47    
Membership interests of VIE subject to mandatory redemption        
Liabilities        
Total liabilities of VIE $ 35 $ 35