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Other Long-Term Assets Other Long-Term Assets (Details) (USD $) In Millions, unless otherwise specified | Sep. 30, 2013 | Sep. 30, 2012
--- | --- | ---
Other Long-Term Assets |  |
EnergyRight® receivables | $ 117 | $ 115
Unamortized debt Issue cost of power bonds | 75 | 70
Loans and other long-term receivables, net | 73 | 76
Coal contract derivative assets | 1 | 107
Prepaid capacity payments | 62 | 59
Currency swap asset | 28 | 21
Other | 89 | 61
Total other long-term assets | 445 | 509
Energy Right Program |  |
Other Long-Term Assets |  |
Number of days in default | 180 days |
Energy Right loans receivable, net of discount | 150 | 150
Energy Right Program |  |
Other Long-Term Assets |  |
Number of days in default | 180 days |
Energy Right Solutions program obligation | $ 186 | $ 185

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