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Other Long-Term Assets (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2012 | Sep. 30, 2012
--- | --- | ---
Other Long-Term Assets |  |
EnergyRight receivables | $ 117 | $ 115
Coal contract derivative assets | 97 | 107
Loans and other long-term receivables, net | 80 | 76
Currency swap asset | 34 | 21
Other | 194 | 190
Total other long-term assets | 522 | 509
Energy Right Program |  |
Other Long-Term Assets |  |
Number of days in default | 180 days |
Energy Right loans receivable, net of discount | 152 |
EnergyRight obligation | $ 187 |

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