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Risk Management Activities and Derivative Transactions Counterparty Credit Risk (Details) |  |  | 9 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2013 Customers | Sep. 30, 2012 Customers | Jun. 30, 2013 Credit of Customers [Member] | Jun. 30, 2013 Power Purchase Agreement Megawatts
Derivative |  |  |  |
Number of customers that represent the percent of outstanding accounts receivable | 3 | 3 |  |
Percent of total outstanding accounts receivables | 26.00% | 26.00% |  |
Percent of operating revenue represented by TVA's largest industrial customer |  |  | 5.00% |
Megawatts |  |  |  | 440

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