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Other Long-Term Assets (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2012
Sep. 30, 2011
Other Long-Term Assets    
Loans and other long-term receivables, net $ 200 $ 74
Coal contract derivative assets 111 285
Other 138 13
Total other long-term assets 449 372
Energy Right Program
   
Other Long-Term Assets    
Number of days in default 180  
Energy Right loans receivable, net of discount 148  
Energy Right obligation $ 182