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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 |

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