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Other Long-Term Liabilities (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Sep. 30, 2012
Other Long-Term Liabilities    
Interest rate swap liabilities $ 1,609 $ 1,723
Environmental agreements liability 237 237
Coal contract derivative liabilities 189 205
EnergyRight® purchase obligation 150 148
Commodity swap derivative liabilities 50 59
Currency swap liabilities 34 54
Other 263 254
Total other long-term liabilities 2,532 2,680
Energy Right Program
    
Other Long-Term Liabilities    
Number of days in default 180 days  
EnergyRight obligation, current portion $ 37