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Other Long-Term Assets (Details) (USD $) In Millions, unless otherwise specified |  |  | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2014 | Sep. 30, 2013 | Jun. 30, 2014 Energy Right Program | Jun. 30, 2014 Other Noncurrent Assets [Member] | Sep. 30, 2013 Other Noncurrent Assets [Member] | Jun. 30, 2014 Accounts Receivable [Member] | Sep. 30, 2013 Accounts Receivable [Member]
Other Long-Term Assets |  |  |  |  |  |  |
EnergyRight receivables |  |  |  | $ 119 | $ 117 | $ 33 | $ 33
Unamortized debt issue cost of power bonds |  |  |  | 65 | 75 |  |
Loans and other long-term receivables, net | 96 | 67 |  | 105 | 73 |  |
Prepaid capacity payments |  |  |  | 55 | 62 |  |
Restricted cash |  |  |  | 56 | 0 |  |
Currency swap asset, net | 15 | 28 |  | 15 | 28 |  |
Coal contract derivative assets |  |  |  | 2 | 1 |  |
Other |  |  |  | 87 | 89 |  |
Total other long-term assets | $ 504 | $ 445 |  |  |  |  |
Number of days in default |  |  | 180 days |  |  |  |

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