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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 |

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- Definition Carrying amount as of the balance sheet date of the liability arising from commodity contracts such as futures contracts tied to the movement of a particular commodity, which are expected to be converted into cash or otherwise disposed of after a year or beyond the normal operating cycle, if longer. + References No definition available. + Details
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