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Risk Management Activities and Derivative Transactions Counterparty Credit Risk (Details) |  |  | 6 Months Ended |
--- | --- | --- | --- | ---
Mar. 31, 2013 Customers | Sep. 30, 2012 Customers | Mar. 31, 2013 Credit of Customers | Mar. 31, 2013 Credit of Suppliers Suppliers | Mar. 31, 2013 Power Purchase Agreement Megawatts
Derivative |  |  |  |  |
Number of customers that represent the percent of outstanding accounts receivable | 2 | 3 |  |  |
Percent of total outstanding accounts receivables | 18.00% | 26.00% |  |  |
Percent of operating revenue represented by TVA's largest industrial customer |  |  | 5.00% |  |
Number of suppliers |  |  |  | 11 |
Megawatts |  |  |  |  | 440

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- Definition Megawatts of summer net capability + References No definition available. + Details
Name: | tve_Megawatts
Namespace Prefix: | tve_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition The number of customers that represent the percent of outstanding accounts receivable. + References No definition available. + Details
Name: | tve_NumberOfCustomersThatRepresentPercentOfOutstandingAccountsReceivable
Namespace Prefix: | tve_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition The number of suppliers. + References No definition available. + Details
Name: | tve_NumberOfSuppliers
Namespace Prefix: | tve_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition The percent of total outstanding accounts receivables represented by a certain number of customers. + References No definition available. + Details
Name: | tve_PercentOfTotalOutstandingAccountsReceivables
Namespace Prefix: | tve_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
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Period Type: | duration

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- Definition Percentage of revenue generated from a single external customer that accounts for 10 percent or more of an entity's revenues. + References No definition available. + Details
Name: | us-gaap_EntityWideRevenueMajorCustomerPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration