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Variable Interest Entities (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2012
Jan. 17, 2012
Sep. 30, 2011
Sep. 30, 2003
Current assets        
Restricted cash of variable interest entity $ 30   $ 0  
Total assets 30      
Current liabilities        
Accrued interest 22      
Current maturities of long-term debt of variable interest entities 12   0  
Total current liabilities 34      
Long-term debt, net        
Long-term debt of variable interest entities 988   0  
Total long-term debt, net 988      
Total liabilities 1,022 1,000    
VIE Financing        
Face amount       1,000
Additional cost of ownership   0    
JSCCG
        
VIE Financing        
Face amount   900    
Lease term   50    
Holdco
        
VIE Financing        
Face amount   100    
Membership interest in variable interest entities   $ 100