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Other Long-Term Liabilities (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2012
Sep. 30, 2011
Other Long-Term Liabilities    
Interest rate swap liabilities $ 1,741 $ 463
Environmental agreements liability 252 346
Coal contract derivative liabilities 236 119
Currency swap liabilities 104 131
Commodity swap derivative liabilities 90 78
Swaption liability 0 1,077
Other 396 191
Total other long-term liabilities 2,819 2,405
Energy Right Program
    
Other Long-Term Liabilities    
Number of days in default 180  
Energy Right obligation $ 182