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Other Long-Term Assets Other Long-Term Assets (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
Other Long-Term Assets |  |  |
Restricted Cash |  | $ 12 | $ 1
Loans and other long-term receivables |  | 10 |
EnergyRight receivables | $ 100 | 112 |
Total other long-term assets | 325 | 362 |
Accounts Receivable [Member] |  |  |
Other Long-Term Assets |  |  |
EnergyRight receivables | 20 | 22 |
Other long-term assets |  |  |
Other Long-Term Assets |  |  |
EnergyRight receivables | 81 | 90 |
Loans and other long-term receivables, net | 125 | 125 |
Commodity contract derivative assets | 1 | 31 |
Restricted Cash and Investments, Noncurrent | 23 | 23 |
Prepaid capacity payments | 19 | 27 |
Other | $ 77 | $ 66 |
Energy Right |  |  |
Other Long-Term Assets |  |  |
Number of days in default | 180 days |  |
Minimum | Energy Right |  |  |
Other Long-Term Assets |  |  |
EnergyRight loan terms | 5 years |  |
Maximum | Energy Right |  |  |
Other Long-Term Assets |  |  |
EnergyRight loan terms | 10 years |  |

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