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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 |

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