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Other Long-Term Liabilities (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2013
Sep. 30, 2012
Other Long-Term Liabilities    
Interest rate swap liabilities $ 1,258 $ 1,723
Environmental agreements liability 219 237
EnergyRight® purchase obligation 147 148
Currency swap liabilities 56 54
Coal contract derivative liabilities 27 205
Commodity swap derivative liabilities 41 59
Other 219 254
Total other long-term liabilities 1,967 2,680
Energy Right Program
    
Other Long-Term Liabilities    
Number of days in default 180 days  
EnergyRight obligation 184  
Accounts Payable and Accrued Liabilities [Member] | Energy Right Program
    
Other Long-Term Liabilities    
EnergyRight obligation $ 37