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Other Long-Term Liabilities (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2013
Sep. 30, 2012
Other Long-Term Liabilities    
Interest rate swap liabilities $ 1,510 $ 1,723
Environmental agreements liability 226 237
EnergyRight® purchase obligation 149 148
Currency swap liabilities 63 54
Coal contract derivative liabilities 52 205
Commodity swap derivative liabilities 41 59
Other 186 254
Total other long-term liabilities 2,227 2,680
Energy Right Program
    
Other Long-Term Liabilities    
Number of days in default 180 days  
EnergyRight obligation 186  
EnergyRight obligation, current portion $ 37